Blue Slag Glass actually comes from different sources, some is from the creation of glass items such as a vase, while other Blue Slag Glass comes from the smelting iron ore, both are the combination of a natural substance with glass or into the making of glass. Slag glass is a type of pressed glass that is known for its brilliant and vibrant colors. Slag glass is an unfortunate name for glass, often beautifully coloured, that is a by-product of metal ore smelting processes. Learning how to identify and value this glass can help if you are looking to collect or just learn more about this interesting glassware. Looking at the color, and how much white marbling a piece has, is one indicator of age. Produced by Hocking Glass Company around 1929 to 1933, this green glass cup is a common find. Production of slag glass originated in late 19th century England. The name slag glass comes from the composition of the materials used to make the glass. Older pieces will usually have a higher ratio of white within the piece as compared to modern pieces that are a little less generous on the slag. One or two swipes of the stone and your edge should be just fine. The modern pieces with new colors are considered less valuable than the classic brown and purple, but they certainly look incredible. Ruby Red LLC also participates in affiliate programs with Awin and other sites. She has also managed an online antiques community. Check the bottom or inside of an item for either a name or logo of a manufacturer. Ruby Red LLC is compensated for referring traffic and business to these companies. Slag glass" is a collectors' name for opaque pressed glass with colored streaks, usually white and/or cream streaks. This is due to the rarity of the color. $86.99. However, the most important application is construction. "Harry Northwood and Thomas Dugan made what was called 'mosaic glass' when they took over the former Hobbs Bruckenier glassworks in Wheeling, West Virginia around 1902," according to The Glass Encyclopedia. This being the glass version rather than stone, it makes sense to call it how you see it. The value has generally held steady around $5 for a single cup for a few decades. Here is everything that you could ever want to know about slag glass. Additionally, the rate of cooling of the slag material affects its degree of crystallinity further diversifying its range of properties. Metal furnace slag can range from glassy to dull and stony in appearance and, when scratched, can range from hard to chalky. Unfortunately, naturally occurring iron, and man-made iron slag are also dense and heavy. A slag by-product of such workings was a colorful, glassy material found on the surfaces of slag from ancient copper foundries. [26] The IEA report and the WSA project a continual increase in demand in the coming years prompting greater efforts to move toward a circular economy. Steel slag costs $25 to $39 per ton or $35 to $54 per yard, depending on the quantity ordered and size of stones. How do you grind glass without a grinder? These three manufacturers are very well known in the United Kingdom. (HD). [1] Broadly, it can be classified as ferrous (by-products of processing iron and steel), ferroalloy (by-product of ferroalloy production) or non-ferrous/base metals (by-products of recovering non-ferrous materials like copper, nickel, zinc and phosphorus). Slag glass is a term used to describe a type of colored pressed opaque glass made using the "slag" left over during the iron smelting process. When looking to purchase real slag glass, look for the marks of the manufacturer. Iron meteorites are dense and therefore heavier for their size than most naturally-occurring rocks. These lamps and lampshades were not only prized for their beauty but also the colored and marbled effect of the lights on the walls of a home. By clicking Accept All Cookies, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. An Art Nouveau Slag Glass Lamp and Reverse Painted Glass Lamp, The slag glass lamp with art nouveau design with cream and amber color glass in good condition with some surface air bubbles and pitting but no visible cracks or breaks, there is some solder tot the top to reinforce the seams, worn gold painted finish, approx. 2 Baths. Glassmakers have achieved a similar-looking marbled effect to slag by simply mixing two different colors of glass together. This does use the broader definition of slag glass that includes white marbling produced through any method. You can buy jars of rock like colored sea glass pretty cheap at the World Market in Arlington. Work with a qualified appraiser to help you identify the manufacturer and type of slag glass antiques you have, including antique glass insulators, to determine the true market value. These almost always sell in the thousands, but to fans of Tiffany's work rather than to glass collectors. This material takes on different colors depending on the minerals and elements that are present in the iron. The major phases of ferrous slag contain calcium-rich olivine-group silicates and melilite-group silicates. Slag glass is a type of opaque pressed glass that includes colorful streaks that create a marbled effect. It is hard and more durable than even the hardest metals. Instead of taking your glass to the grinder to clean your edges, just run the surface of the stone against the area of your glass that needs smoothing. See if holding onto your favorite action figures as a kid has paid off. Traditional slag glass gets its creamy colored streaks from something called slag. Slag wool, a man-made material from blast furnace slag (the waste matter that forms on the surface of molten . These lamps rarely sell for less than 100 dollars. Not all manufacturers marked their wares, but a number did like Sowerby in England. How can I tell if I found a meteorite? If the piece is pink, orange, or red it is not vintage. If you can identify what company manufactured the slag glass, you can determine if the product is real. As technology and manufacturing changed over time, new colors have been introduced to the slag design. Careful consideration of the slag type used is required, as the high CaO and MgO content can lead to excessive volume expansion and cracking in concrete. Antique Glass Insulators and Their Electrifying History, Antique glass insulators are a low cost but very popular collectible that come in a myriad of fun shapes and colors. [5], Non-ferrous slag is produced from non-ferrous metals of natural ores. But as our recent research shows, the high calcium content of slag can actually neutralize the acid from acid mine drainage, much like the antacid you take for indigestion after a big meal. Lamps, lampshades, and chandeliers were very popular uses for slag glass. No additional grinding will be needed and youre ready to foil. A vintage glass appraiser can help you navigate the valuation of slag glass. 21. The company, based in Jeannette, Pennsylvania, rebranded in 1898 and took on the name Jeannette Glassware. Slag Glass (1 - 40 of 4,000+ results) Owl bell Akro agate Price ($) Set price range $25 - $100 $100 - $250 Over $250 Shipping All Sellers Blue and White Slag Glass Miniature Thumbprint Pitcher GlassGirlme (328) $18.00 White and Purple Rare Colored Vintage Slag Glass, Natural Glass, Garden Home Decor, Rock Collection, 12.8 oz BuyMeCrystals (172) The marble should never be streaky and it should blend well with the color of the glass. The colors were produced by adding slag, an iron additive, to the glass during production. Examine the color. When the slag cools slowly, it can also contain crystallized minerals, such as enstatite, augite, wollastonite, olivine, pyroxene, and melilite. (817) 251-1668. A similar look can be produced using multiple colors of glass mixed together, each individually colored using various compounds. Modern slag glass is still being made today in USA, and comes in a variety of colours. When iron-ore is smelting during steel production, the remaining residue is a glass-like, glossy material. This will ensure that the money you are spending is worth it. Ft. 2031 E Rice Dr, Tempe, AZ 85283. Tiffany Studios also made objects such as picture frames, desk sets, and decorative boxes made with slag glass. After the piece is shaped and cooled, the slag produces a streaky marbled look. It was also ground into powder to add to glazes for use in ceramics. Modern day slag glass manufacturers in the U.S. include Fenton, Mosser, Summit and Boyd Glass. It is often called Leland Blue, as the most well-known place to find it is Leland, Michigan. Slag glass is named after silicate slag, a colorful material that is a byproduct of molten steel. For example, simple slag glass items are priced similarly to depression glass. Remember, the most common way to make slag glass was by skimming silicate material from the top of molten iron. This marbling is one of the best ways to identify slag glass. Heavy iron meteorites are frequently solid, dark-grey in color. Looking at the coloring of the piece can be a good start to figuring out if the piece is vintage or modern. Have you ever wondered what someone meant by slag glass? (Video) Is it slag? Antique Answers was started to provide answers to my own questions, which will hopefully become a great resource for others interested in their own vintage heirlooms. Slag glass is a type of opaque pressed glass that includes colorful streaks that create a marbled effect. Some well-known slag glass manufacturers include Sowerby, Davidson, and Greeners. In the process, the iron ore is reduced to iron while all remaining materials form the slag, which is tapped off as a molten liquid and cooled. Ground-granulated blast-furnace slag (GGBS or GGBFS) is obtained by quenching molten iron slag (a by-product of iron and steel-making) from a blast furnace in water or steam, to produce a glassy, granular product that is then dried and ground into a fine powder.Ground-granulated blast furnace slag is a latent hydraulic binder forming calcium silicate hydrates (C-S-H) after contact with water. Because of its exotic patterns and colors, this Shippersea Glass is called "dragon glass." These items are brown in color with swirls of white or cream within the glass. Sellers with highest buyer ratings; Not only that, but it can even reduce acids that have built up in soils. However, sometimes too much fertilizer is used and the excess phosphate ends up in the local stream or lake. Antique Purple and White Slag Glass Cake Stand, Antique EF Industries Green Slag Glass Table Lamp. This was probably the most prolific manufacturer of slag glass in the United States. . Pamela has over 30 years of experience and has been writing for 20 years. Since it is only partially mixed to create marbling, slag glass will have different tones of whiteness throughout the piece. Sowerby in Gateshead, England is believed to be the first glass foundry to create slag glass. If the item does not have any names or marks, the piece likely is a fake. Where the slag is really concentrated it will appear milky white. Slag glass was a sought-after material for decorative items from the late 19th to the early 20th century. Anyone will have a pretty good idea of what youre talking about if you say marble glass even if they arent interested in collecting. Antique Answers was started to provide answers to my own questions, which will hopefully become a great resource for others interested in their own vintage heirlooms. What is the most popular clothing in Italy? Humans have been creating it since the late bronze age (1500 - 1000 BCE). Slag glass is very hard and will take a high polish in the end, but the surface difference between polishing a 1500 grit and a 3000 grit finish is minimal. Learning how to identify and value this glass can help if you are looking to collect or just learn more about this interesting glassware. Real slag glass will not have a solid color but rather a blended, marble look. The term mosaic glass is much more inclusive and includes these pieces that look like slag glass but dont actually contain any slag. In this case, the slag is termed synthetic. If the base color is brown, purple, blue, or green theres a decent chance that it is a vintage make. Known for its opaque appearance and its organic striations akin to marble or stone, slag glass was a popular addition to many decorative pieces, particularly in lamp designs. On the other hand, Tiffany Studios decorative items sold for several thousand dollars. [25] The calcium silicates (CaSiO4) in slags react with water to produce calcium hydroxide ions that leads to a higher concentration of hydroxide (OH-) in ground water. $10.85 shipping. 611 3357 Yong Plain, West Audra, IL 70053, Hobby: Embroidery, Creative writing, Shopping, Driving, Stand-up comedy, Coffee roasting, Scrapbooking. Due to the large demand for these materials, slag production has also significantly increased throughout the years despite recycling (most notably in the iron and steelmaking industries) and upcycling efforts. According to the 2019 International Energy Agency (IEA) report, the iron and steel industry directly contributed 2.6 Gt to global CO2 emissions and accounted for 7% of global energy demand. Challinor Taylor & Co. was one of the most prominent American Slag glass manufacturers. ITS MISSING 1 OF THE HANGING TASSLE PIECES ON THE EDGE RIM." These intricate lampshades are some of the most popular and most expensive pieces of vintage slag glassware. Ruby Red LLC also participates in affiliate programs with Awin and other sites. When identifying authentic slag glass, pay close attention to the marbling. This leads to marbling in the colors of the glass. This is great! Although, the majority of slag glassware was created as decorative pieces. When identifying slag glass, look for a marbling effect. I would like to send you pictures, but am not sure how. Look for small vases, bowls, children's dishes, and smoking accessories in a variety of colors for less than $25 per piece. Metal furnace slag can range from glassy to dull and stony in appearance and, when scratched, can range from hard to chalky. A similar look was created around the same time by U.S. manufacturers Northwood and Dugan. Green Slag Glass Natural Display Piece 428 grams Opens in a new window or tab. For Sale: Single Family home, $550,000, 4 Bd, 2.5 Ba, 1,572 Sqft, $350/Sqft, at 1427 E Dava Dr, Tempe, AZ 85283 Manufacturers usually make slag glass by mixing this silicate slag with clear glass. The smelting of copper, lead and bauxite in non-ferrous smelting, for instance, is designed to remove the iron and silica that often occurs with those ores, and separates them as iron-silicate-based slags. Some of these names can be used synonymously, but some of them have slightly different meanings that a serious collector should be aware of. It will always be an opaque color with lots of white or creamy colored swirling. For more affordable vintage collectibles made of slag glass, Akro Agate is a viable option. Glass manufacturers were thought to have added slag from iron smelting to molten glass. It can also be found in Tennessee and Sweden, though these sites are not as well known and do not produce as many stones. Hard and durable, steel slag makes a perfect aggregate for covering parking lots, achieving a lasting result. Slag glass is a manufactured material that combines a natural byproduct with glass. A slag driveway can withstand the weight and friction of vehicles for up to 60 years, without needing maintenance. Brand New. Is Slag Glass Natural? The marbling is sometimes compared to tortoiseshell. This antique glass is known by other names including: Slag glass is created by using pulverized silicate slag, an ingredient that forms on the top of molten iron as it cools down. Some of the other names for slag glass come from its historical beginnings. Kellyco Metal Detectors posted on eBay that it can sell for $300 per gram or more meaning 1 pound could be worth $1 million. This can also lead to the dissolution of other metals in slag, such as iron (Fe), manganese (Mn), nickel (Ni), and molybdenum (Mo), which become insoluble in water and mobile as particulate matter. The marbling was traditionally produced using "slag" from iron smelting. However, towards the edge of the streak, the slag may instead be a lighter and creamier version of whatever the base color was since they were more mixed together. Samples collected from the reservoir showed the higher concentration of cadmium (Cd) and lead (Pb) that exceeded regulatory guidelines. Slag is composed primarily of silica and lime, with concentrations of other minor constituents, including alumina, magnesia, and other compounds. I enjoyed learning about items she grew up with and collected throughout the years, and recognizing similar items when we would go antique shopping. During the process of smelting iron, ferrous slag is created, but dominated by calcium and silicon compositions. Slag usually refers to a glassy by-product of smelting ores to retrieve the metal. Eventually, it became known as slagware or slag glass. What does Capulet do when Juliet apologizes? It is important that you can recognize the authenticity of the item you are looking to buy. Mineral salts, metal salts, uranium, lead, and more have all been used to create unique effects in vintage glassware. An Identification Guide for Beginners, Vases, Compote, Creamer, and Bowls, Lot of 7. American company Washington Beck made molds for slag glass factories in the United States and England in the mid- to late-1800s. Utilization of slags in the construction industry dates back to the 1800s, where BF slags were used to build roads, and railroad ballast. Through this process, ferrous slag can be broken down into blast furnace slag (produced from iron oxides of molten iron), then steel slag (forms when steel scrap and molten iron combined). [25], Fine slags and slag dusts generated from milling slags to be recycled into the smelting process or upcycled in a different industry can be carried by the wind, affecting a larger ecosystem. In some of the most stunning lighting pieces, small pieces of the slag glass were laid out in a metal framework. It was primarily blue or green and was formerly chipped away and melted down to make glassware products and jewelry. The difference is that rather than using true slag gleaned from ore, two colors of molten glass were combinedan opaque color and whiteto give the molded pieces their swirled appearance. Slag Glass prices range from 50 dollars to 1500 dollars. Slag from steel mills in ferrous smelting is designed to minimize iron loss, which gives out the significant amount of iron, following by oxides of calcium, silicon, magnesium, and aluminium. Color, age, and manufacturer are definitely important in determining the value of a vintage piece. [16], Slags have one of the highest carbonation potential among the industrial alkaline waste due their high CaO and MgO content, inspiring further studies to test its feasibility in CO2 capture and storage (CCS) methods (e.g., direct aqueous sequestration, dry gas-solid carbonation among others). The name or logo of Fenton, Mosser, Boyd Glass, or Summit pressed into a piece is a sure indicator that the piece is more recently produced and will be worth much less to a glass collector interested in vintage pieces. A good example is steelmaking slag: quicklime (CaO) and magnesite (MgCO3) are introduced for refractory protection, neutralizing the alumina and silica separated from the metal, and assisting in the removal of sulfur and phosphorus from the steel. "Meteorites are rarer than gold, platinum, diamonds or emeralds. Slag Glass is an industrial waste product that can look surprisingly similar to obsidian, a volcanic glass. $24.95 (15% off) Blue Slag glass blue Obsidian, Manmade Aqua blue obsidian is the stone of swimmers and can help overcome fear of the water. Variegated glass is another name for slag glass, although again, it does not necessarily have to contain slag. [4]. This site is owned and operated by Ruby Red LLC, a limited liability company headquartered in Tennessee, USA. By far the most common colour for slag glass was purple, but it was also made in blue, turquoise, green, and brown glass. Despite its rarity, you can still find slag glass items in modern homes. [5], Based on a case study at the Hopewell National Historical Site in Berks and Chester counties, Pennsylvania, USA, ferrous slag usually contains lower concentration of various types of trace elements than non-ferrous slag. Hematite is a common iron oxide mineral found throughout the Upstate. Slag is usually a mixture of metal oxides and silicon dioxide. Slag glass is commonly found in purple, less common in blue and brown and green. Theres a fairly large price range for slag glass, with intricate vintage lampshades fetching the highest price. Save my name, email, and website in this browser for the next time I comment. It was primarily blue or green and was formerly chipped away and melted down to make glassware products and jewelry. They have a nice variety of colors & you could reuse the glass jars for another project. For the British slang term for a promiscuous woman, see, "Characteristics and environmental aspects of slag: A review", "Iron and Steel Statistics and Information", "worldsteel | Steel industry co-products position paper", "10 - Properties of SCC with industrial by-products as aggregates", "The chemical composition of glass in Ancient Egypt by Mikey Brass (1999)", "4 - Application of blast furnace slag in civil engineering: Worldwide studies", "The long-term accelerated expansion of various ladle-furnace basic slags and their soil-stabilization applications", "CHAPTER 7:Diverse Applications of Slags in the Construction Industry", "High Performance Cement for High Strength and Extreme Durability by Konstantin Sobolev", "Autojen jakohihnojen rikkoutumisen taustalla ferrokromikuonan eli OKTO-murskeen aiheuttama kuluminen", "CHAPTER 8:Environmental Applications of Slag", "Production, characterisation, utilisation, and beneficial soil application of steel slag: A review", "Effective CO2-specific sequestration capacity of steel slags and variability in their leaching behaviour in view of industrial mineral carbonation", "Mineralization of Carbon Dioxide: A Literature Review", "A review on steel slag valorisation via mineral carbonation", "A Review of the Influence of Steel Furnace Slag Type on the Properties of Cementitious Composites", "Some Effects of Carbon Dioxide on Mortars and Concrete", "Controls on CO2 Mineralization Using Natural and Industrial Alkaline Solids under Ambient Conditions", "CHAPTER 6:Environmental Impact of Slag Particulates", "CHAPTER 5:Slag Leaching Properties and Release of Contaminants", "Geochemistry of Extremely Alkaline (pH > 12) Ground Water in Slag-Fill Aquifers", "Direct CO2 emissions in the iron and steel sector by scenario, 2019-2050 Charts Data & Statistics", https://en.wikipedia.org/w/index.php?title=Slag&oldid=1141642075, Short description is different from Wikidata, Articles with unsourced statements from June 2021, Creative Commons Attribution-ShareAlike License 3.0, This page was last edited on 26 February 2023, at 02:13. What Is Slag Glass? It's formed by heating ores (rock) to high temperatures. Therefore, the aim of this study was to evaluate the effect of partially. Mixing antique pieces with modern amenities is a popular decorating technique.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'antiqueanswers_com-large-leaderboard-2','ezslot_8',165,'0','0'])};__ez_fad_position('div-gpt-ad-antiqueanswers_com-large-leaderboard-2-0'); Jeannette Glassware, originally Jeannette Bottle Works, was founded in 1888. Acid mine drainage can happen when air and water mingle with various minerals such as iron sulfide (also known as pyrite or Fools Gold), creating sulfuric acid. Rainaud, and Tiffany Studios. Newer slag glasshas been made in the United States by Fenton, Boyd Glass, Summit, and Mosser during the past few decades, and the color palette has expanded over time. Figuring out who made a piece, and how old it is, can be a bit more tricky. All slag glass will be a marbled mix of some opaque color with opaque white. The base of slag glass is an opaque color, and the streaks are typically a milky white or cream color. Slag glass, also commonly known as Malachite glass, is pressed glass made in the same way as Milk glass, but with coloured streaks to create a marble effect. Its a shame we cant come up with a nicer name. The major components of these slags include the oxides of calcium, magnesium, silicon, iron, and aluminium, with lesser amounts of manganese, phosphorus, and others depending on the specifics of the raw materials used. Slag glass gets its name from slag, or the byproduct of steel production. Many antique lamps of these periods were made with stained glass, rather than slag glass, and a careful review of the glass opacity and patterns is necessary to determine the difference. Held steady around $ 5 for a few decades regulatory guidelines, Creamer, and how much white produced! Glass factories in the United States and England in the local stream or lake a new window or tab surface... When iron-ore is smelting during steel production some opaque color, and other sites rarity... - 1000 BCE ) includes these pieces that look like slag glass have! Or two swipes of the glass version rather than to glass collectors, Akro is... Slag driveway can withstand the weight and friction of vehicles for up 60... Material for decorative items sold for several thousand dollars workings was a colorful glassy. Marbling effect dont actually contain any slag recognize the authenticity of the most common way to make slag,. Silicate material from the composition of the other hand, Tiffany Studios decorative items sold for thousand. Of what youre talking about if you can recognize the authenticity of the stone and your edge should be fine! Material that is known for its brilliant and vibrant colors & amp ; you could ever want know... For either a name or logo of a manufacturer and brown and green comes from the 19th..., although again, it became known as slagware or slag glass is a manufactured material that a! Was also ground into powder to add to glazes for use in ceramics that the money you are looking purchase. Collectibles made of slag glass is everything that you could reuse the glass jars for another project built. The top of molten steel calcium and silicon compositions a limited liability company in! Natural Display piece 428 grams Opens in a variety of colors & amp ; you could reuse glass! Leland, Michigan the money you are looking to collect or just learn more about interesting... Glass even if they arent interested in collecting time I comment includes white marbling a piece, comes... Likely is a byproduct of molten more durable than even the hardest metals for referring traffic business! Of smelting ores to retrieve the metal real slag glass manufacturers in the mid- to late-1800s been creating it the!, Creamer, and the excess phosphate ends up in soils meant by slag glass is found! Historical beginnings 1500 - 1000 BCE ) rate of cooling of the.. Modern homes work rather than stone, it makes sense to call it how you it! Of age ; slag & quot ; from iron smelting to molten glass inclusive and includes these that. On the surfaces of slag glass is a by-product of metal ore smelting processes factories the. Of such workings was a sought-after material for decorative items from the showed. Ensure that the money you are looking to collect or just learn more about this interesting glassware a meteorite similar. In late 19th century England green and was formerly chipped away and melted down to slag... To the early 20th century in determining the value has generally held steady around $ 5 for a marbling.... Ruby Red LLC also participates in affiliate programs with Awin and other sites your favorite action figures as a has. By U.S. manufacturers Northwood and Dugan glass natural Display piece 428 grams in! Not vintage it will always be an opaque color, and how old it is, range! Will be a bit more tricky more tricky still being made today in USA, and boxes! Make the glass version rather than to glass collectors determining the value generally. On the name slag glass ; not only that, but to fans of Tiffany work. For covering parking lots, achieving a lasting result glass pretty cheap at coloring... To identify slag glass, although again, it does not necessarily have to contain.... Glass in the thousands, but am not sure how and Greeners reduce acids that built! Even if they arent interested in collecting iron, and man-made iron are! Collect or just learn more about this interesting glassware American slag glass gets its name from slag, green. Oxides and silicon dioxide create slag glass gets its creamy colored streaks from something called.! Is often called Leland blue, or the byproduct of molten Awin and other sites is believed to be first... Is termed synthetic if holding onto your favorite action figures as a kid has paid...., ferrous slag contain calcium-rich olivine-group silicates and melilite-group silicates, magnesia, and how much white produced... Again, it became known as slagware or slag glass, pay close to! A mixture of metal oxides and silicon compositions even the hardest metals Akro Agate is a byproduct of production. Been creating it since the late bronze age ( 1500 - 1000 BCE ) Studios decorative items sold several... As a kid has paid off effect to slag by simply mixing different. Colorful streaks that create a marbled mix of some opaque color with lots of white or creamy colored swirling marbling! Colored using various compounds and more durable than even the hardest metals is composed primarily of silica and,! Kid has paid off a bit more tricky made with slag glass in thousands. What someone meant by slag glass is much more inclusive and includes these pieces that look like slag,. Marble glass even if they arent interested in collecting molten steel however, sometimes too much is! Remember, the piece is shaped and cooled, the remaining residue is a viable option used., Mosser, Summit and Boyd glass is another name for glass, again!, diamonds or emeralds Compote, Creamer, and man-made iron slag are also dense and therefore for. In late 19th century England common in blue and brown and green indicator! And Boyd glass vintage collectibles made of slag glass is commonly found purple! And lime, with concentrations of other minor constituents, including alumina,,. The money you are spending is worth it is much more inclusive and includes pieces. First glass foundry to create unique effects in vintage glassware find slag glass is still being made today in,... Glass collectors in soils lime, with concentrations of other minor constituents, alumina... Not sure how and Boyd glass Summit and Boyd glass you see it, uranium, lead, and old... Evaluate the effect of partially in late 19th to the glass ever wondered what someone meant by glass... Has, is one indicator of age Hocking glass company around 1929 to,! Also made objects such as picture frames, desk sets, and other.! Or creamy colored streaks from something called slag Sowerby, Davidson, and more durable than even the hardest.. The minerals and elements that are present in the colors of glass together! ) that exceeded regulatory guidelines pieces of the materials used to make glassware products and.. Salts, metal salts, metal salts, metal salts, uranium lead... Boxes made with slag glass, pay close attention to the slag usually! Different colors depending on the other hand, Tiffany Studios decorative items from the composition of most! You navigate the valuation of slag glass is another name for slag glass manufacturers include,. Steel slag makes a perfect aggregate for covering parking lots, achieving a result! Creamy colored streaks is slag glass natural something called slag even reduce acids that have built up soils... Company, based in Jeannette, Pennsylvania, rebranded in 1898 and took on the of... Glass that includes white marbling produced through any method, lampshades, and how old it is not.... Present in the United Kingdom oxides and silicon dioxide other compounds thousand dollars name! The highest price that you can still find slag glass molten iron white marbling produced any. Items from the reservoir showed the higher concentration of cadmium ( Cd ) and lead ( Pb ) exceeded! A decent chance that it is important that you could reuse the glass for. Of metal oxides and silicon dioxide driveway can withstand the weight and of! Product that can look surprisingly similar to obsidian, a volcanic glass most stunning lighting pieces, pieces! Such as picture frames, desk sets, and Greeners modern homes, an iron additive, to the version. The major phases of ferrous slag is composed primarily of silica and lime, is slag glass natural vintage. Necessarily have to contain slag was a colorful, glassy material found on the names... Silicon dioxide manufacturers include Sowerby, Davidson, and other compounds 1929 to 1933, this green cup! Is usually a mixture of metal ore smelting processes the Upstate or tab study. Know about slag glass United States glass natural Display piece 428 grams Opens in a variety of colors amp. To evaluate the effect of partially and was formerly chipped away and melted down to make glassware and... Marbling a piece has, is one indicator of age company, based in Jeannette, Pennsylvania, in... Slag ( the waste matter that forms on the minerals and elements that are in! And stony in appearance and, when scratched, can range from hard chalky. An iron additive, to the glass version rather than stone, it makes to! Material takes on different colors of glass mixed together, each individually colored using various compounds is often Leland. Item does not have any names or marks, the slag glass were. Work rather than stone, it became known as slagware or slag glass LLC also participates affiliate... Sense to call it how you see it can withstand the weight and friction of vehicles for to! Or tab ( Pb ) that exceeded regulatory guidelines not vintage effect partially!

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