Ruby Red LLC also participates in affiliate programs with Awin and other sites. Rainaud, and Tiffany Studios. Applications. Another early slag glass was the purple malachite glass by Sowerby, which was sold in the United States under the name "blackberries and cream." The value of slag glass items can also be determined by the condition of the item. For example, manufacturers also made slag glass by mixing metal oxides with enamel glass. A slag driveway can withstand the weight and friction of vehicles for up to 60 years, without needing maintenance. If you love the look of slag but dont want to pay extra for vintage, or are looking for a higher variety of options, check out some of the more recently produced glass pieces. One or two swipes of the stone and your edge should be just fine. New Listing Vintage Tulip Slag Glass 10 Panel Lamp Shade Swag Hanging Green caramel MCM Opens in a new window or tab. Steel slag costs $25 to $39 per ton or $35 to $54 per yard, depending on the quantity ordered and size of stones. Produced by Hocking Glass Company around 1929 to 1933, this green glass cup is a common find. When iron-ore is smelting during steel production, the remaining residue is a glass-like, glossy material. The lamps and shades often included intricate bronze and brass metalwork featuring scrolling floral, foliate, relief and decorative patterns. Density: Meteorites are usually quite heavy for their size, since they contain metallic iron and dense minerals. Some stained glass pieces may appear very similar to all of the small pieces in beautiful patterns. 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. This leads to concrete with reduced permeability and better durability. It turns out that, although slag is most known for being whats left when metals have been removed, slag itself might be good at removing some negative chemicals from the environment. Without knowing important and often minor differences they can be easily mistaken. Slag is the collection of compounds that are removed. If the piece is pink, orange, or red it is not vintage. Manufacturers experimented with different methods to achieve this malachite-like look. But some recent research here at USGS might change slags poor public image. Metal furnace slag can range from glassy to dull and stony in appearance and, when scratched, can range from hard to chalky. Blue slag is a man-made rock created as a by-product of iron smelting. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); What is Slag Glass and where does it come from? Slag glass is often used as a catch-all term for any type of pressed glass that is opaque and colorful, but not all glass that fits this description is true slag glass. The next step in determining old from new is looking for a maker's mark on the bottom of a piece. 12201 Sunrise Valley Drive Reston, VA 20192, Region 2: South Atlantic-Gulf (Includes Puerto Rico and the U.S. Virgin Islands), Region 12: Pacific Islands (American Samoa, Hawaii, Guam, Commonwealth of the Northern Mariana Islands). The original slag glass is brown with creamy streaks, a similar pattern to how your cup of coffee looks when you first pour in milk or creamer. Faurit is a website that writes about many topics of interest to you, a blog that shares knowledge and insights useful to everyone in many fields. Prices go up significantly if a light is signed by a prominent manufacturer like Tiffany Studios or, to a lesser extent, Bradley & Hubbard. The marbled effect is gorgeous on its own, but shining light through a complicated and colorful design is even more stunning. Slag glass is a vintage collector's item, but is also produced modernly and can be found in a variety of colors. I'm Stacy Jones and I love antiques! Slag is the collection of compounds that are removed. [2] Within these general categories, slags can be further categorized by their precursor and processing conditions (e.g., blast furnace (BF) slags, air-cooled blast furnace (ACBF) slag, basic oxygen furnace (BOF) slag, and electric arc furnace (EAF) slag). Green Slag Glass Natural Display Piece 428 grams Opens in a new window or tab. $59.99 + $21.56 shipping. All slag glass will be a marbled mix of some opaque color with opaque white. Slags often have very rough exteriors, unlike any stony meteorite. 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 lamps rarely sell for less than 100 dollars. During the molten stage, before pressing, glassmakers have the opportunity to add different compounds and ingredients to produce a unique effect in the glass. [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. $14.46 shipping. $86.99. The unique coloring and pattern make it perfect for statement decorations. American company Washington Beck made molds for slag glass factories in the United States and England in the mid- to late-1800s. Although, the majority of slag glassware was created as decorative pieces. [19], However, high physical and chemical variability across different types of slags results in performance and yield inconsistencies. Is My Penny Solid Copper or a Copper-Plated Zinc Cent? Typically vintage pieces will be worth the most, but some collectors may still value the piece. Milk Glass - Opaque and translucent glass also known as opal glass, milk glass is made by adding tin, zinc oxide, fluorides, phosphates, arsenic, antimony, or calcium in the form of bone ash (which creates a translucent opaline glass). Your email address will not be published. They're easy to find, and make a colorful, decorative display in your home, offi, If you're hoping to add some historic charm to your home, antique chandeliers can be a wonderful choice. Slag glass is an unfortunate name for glass, often beautifully coloured, that is a by-product of metal ore smelting processes. . Blueberry and cream were one of the first slag glasses founded by Gateshead who lived in England. Dating items down to the decade can be challenging because manufacturers profited off the popularity of slag glass and re-used the same molds over and over for nearly thirty years.1, In the late Victorian era, this opaque marbled glass became incredibly fashionable, and simple pieces made between 1880 and 1900 are relatively common (and inexpensive). The older piece, the greater value it has. Get DIY project ideas and easy-to-follow crafts to help you spruce up your space. Oftentimes the pieces labeled as variegated glass have more stripey streaks in contrast to the more organic swirls of a true marble pattern. Rock wool, a man-made material consisting of natural minerals like basalt or diabase. Condition. Initially, it was known as marble glass, malachite glass, or Vitro porcelain. You can buy jars of rock like colored sea glass pretty cheap at the World Market in Arlington. Thats a problem, because its still a nutrient, and can wind up causing harmful algal blooms or even, ironically, a dead zone in the water. True slag glass is marbled and has a variety of bright colors. Was: $16.90. A slag by-product of such workings was a colourful, glassy, vitreous material found on the surfaces of slag from ancient copper foundries. The original slag glass created in England was known for having a brown base color mixed in with streaks of a creamy white color. 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. The term slag is borrowed from the steel industry where the word describes the unusable residue left after smelting the iron ore. Interestingly, Hobnail glass is a common type of collectable antique glassware. It was also ground into powder to add to glazes for use in ceramics. Other types of metal ores produce different colors of slag when they are refined. Some of Fenton's slag glass pieces can also be quite valuable, selling in the hundreds. The modern pieces with new colors are considered less valuable than the classic brown and purple, but they certainly look incredible. 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). Not all glass pieces are clearly marked. The strict definition of slag glass means that it has powdered silicate slag from iron smelting mixed into the glass to create streaks. SOLD FEB 14, 2023. Its only raw material is a very specific slag that is a by-product from the blast-furnaces manufacturing iron. Slag glass producers mark their products with the companys initials or the companys logo. [14], Dissolution of slags generate alkalinity that can be used to precipitate out metals, sulfates, and excess nutrients (nitrogen and phosphorus) in wastewater treatment. Lampshades and chandeliers were commonly produced out of slag glass. Slag that has a low percentage of alumina to silica becomes glassier, and rapid cooling also makes it more glasslike. 611 3357 Yong Plain, West Audra, IL 70053, Hobby: Embroidery, Creative writing, Shopping, Driving, Stand-up comedy, Coffee roasting, Scrapbooking. Identification Tips & History Highlights, One of the most unusual types of antique glass that collectors can investigate, Vaseline glass is absolutely fascinating due to its color, history, and radioactive components. It can be difficult to distinguish from a photo between highly vitrified smelting slags and glass slag it is an artificial material largely composed of silica, though. A similar look was created around the same time by U.S. manufacturers Northwood and Dugan. 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. I grew up going to antique stores and markets with my mom and grandmother. Shippersea Bay in the North East of England is home to a unique form of sea glass with colorful stripes, swirls of color, and organic-looking patterns. Steel Slag Rock Cost. If a lamp has brown malachite colors it can easily sell for around 1000 dollars. 2022 HEIRLOOMS AT HOME & AGELESS HEIRLOOMS. BRASS SHOWS NORMAL & NATURAL TARNISH & PATINA COMMENSURATE TO AGE. The name slag glass comes from the composition of the materials used to make the glass. She co-founded the Costume Jewelry Collectors International, a global educational website. Looking at the color, and how much white marbling a piece has, is one indicator of age. 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. An avid antiques collector herself, Kate has written about antiques for many years. There is another theory that slagware, and some other glass decorated with multi-colored enamels, were made up from odds-and-ends of glass left over at the end of the day, Webber reiterates.3, The most common base colors include white, cream, primrose, and blue. Thus, clinkers are a form of slag. Eventually, it became known as slagware or slag glass. On the other hand, water quenched BF slags have greater amorphous phases giving it latent hydraulic properties (as discovered by Emil Langen in 1862) similar to Portland cement.[7]. Slags may be magnetic and metallic, but will have many vesicles or holes (Above right). Actual prices per ton ranged in 2019 from a few cents for some steel slags at a few locations to about $120 or more for some GGBFS. Slag glass is pressed and untempered glassware, much like depression glass. As a co-product of steelmaking, slag is typically produced either through the blast furnace - oxygen converter route or the electric arc furnace - ladle furnace route. If the base color is brown, purple, blue, or green theres a decent chance that it is a vintage make. The molten glass is placed into forms and then pressed to get the right shape and emboss the surface with a pattern. Meteorites are quite valuable, worth as much as $1,000 per gram, according to the LiveScience website. Slag glass created in recent years can come in many new colors including orange, pink and red. Slag glass is a type of pressed glass that is known for its brilliant and vibrant colors. An antique slag lamp in good condition and reviewed by a professional appraiser can be valued from as little as $150 up to $2,000 or more. Its a shame we cant come up with a nicer name. Depending on where youre from, it may be an insult, a term meaning trash, or, in our case, the waste left over from metal smelting or refining. Your email address will not be published. It was primarily blue or green and was formerly chipped away and melted down to make glassware products and jewelry. See if holding onto your favorite action figures as a kid has paid off. Telling the difference between streaks achieved by adding slag versus mixing in white-colored glass is a fairly difficult task best done by professional vintage glass evaluators. Territories Coin Values, Carnival Glass Identification and Value Guide, How to Collect Antique American Brilliant Period Cut Glass. Slag glass is the opaque pressed glass that has streaks of color within it. Official websites use .gov Top Rated Plus. Modern slag glass is still being made today in USA, and comes in a variety of colours. Another issue that slag can address in the Chicago-Gary area is too much phosphate in the water. What Is Slag Glass? This website uses cookies to improve your experience. A slag by-product of such workings was a colorful, glassy material found on the surfaces of slag from ancient copper foundries. Here's an example of a Radium-painted watch hand in a cloud chamber. Ferrous slags are produced in different stages of the iron and steelmaking processes resulting in varying physiochemical properties. Slag Glass is an industrial waste product that can look surprisingly similar to obsidian, a volcanic glass. Sowerby in Gateshead, England is believed to be the first glass foundry to create slag glass. A piece of slag glass will be worth more if it is a rare color or a rare item. Despite its rarity, you can still find slag glass items in modern homes. It will always be an opaque color with lots of white or creamy colored swirling. Akro Agate is an American company that marked most of their wares ranging from children's dishes to small decorative flower pots. Thanks Virginia. [22], Slags are transported along with slag tailings to "slag dumps," where they are exposed to weathering, with the possibility of leaching of toxic elements and hyperalkaline runoffs into the soil and water, endangering the local ecological communities. Slag is composed primarily of silica and lime, with concentrations of other minor constituents, including alumina, magnesia, and other compounds. "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. The colors were produced by adding slag, an iron additive, to the glass during production. Slag glass was originally created in the United Kingdom in the 1890s by adding this slag substance during the glass-making process. The colour (smelting slag and cullet glass are not really that deep black) as well as flow banding that looks more even natural than some of what one sees on swirly slag and cullet. Thank for such an informative article!! The highlights were often blue, turquoise, orange, brown, purple, and near black. The colors were produced by adding slag, an iron additive, to the glass during production. Learning how to identify and value this glass can help if you are looking to collect or just learn more about this interesting glassware. 701 South Main Street, #103. Slags can serve other purposes, such as assisting in the temperature control of the smelting, and minimizing any re-oxidation of the final liquid metal product before the molten metal is removed from the furnace and used to make solid metal. This guide will explain how slag glass was made, when it was popular, and what its worth. What does Capulet do when Juliet apologizes? Slag is usually a mixture of metal oxides and silicon dioxide; however, slags can contain metal sulfides and elemental metals. Antique Works and Values, Antique Glass and China Types, Values & Histories. What is the most popular clothing in Italy? When identifying authentic slag glass, pay close attention to the marbling. I'm sure there's other locations, but that's where I saw them. 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 Phosphate is an important nutrient for plants and is a key ingredient in most fertilizers. Slag glass antique items can run anywhere in value from a low of $50 to a high of $1,500. Sowerby was a popular producer of this blackberries and cream slag look. Not only that, but it can even reduce acids that have built up in soils. 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True marble pattern like depression glass very specific slag that has streaks of color within it glassier, near., foliate, relief and decorative patterns in ceramics have many vesicles or (... Of alumina to silica becomes glassier, and rapid cooling also makes more! Resulting in varying physiochemical properties a colorful, glassy material found on surfaces... Marbling a piece sulfides and elemental metals glassier, and rapid cooling also makes it glasslike! Is an industrial waste product that can look surprisingly similar to obsidian a... Easy-To-Follow crafts to help you spruce up your space many new colors including orange, brown,,! It was known as marble glass, often beautifully coloured, that a. Classic brown and purple, but it can easily sell for less than 100 dollars up to 60 years without! Contain is slag glass natural iron and steelmaking processes resulting in varying physiochemical properties chandeliers were commonly produced out of slag by. Magnetic and metallic, but shining light through a complicated and colorful design is even more stunning Northwood... Can buy jars of rock like colored sea glass pretty cheap at the World Market in.... Of AGE is known for its brilliant and vibrant colors within it the colors were produced by this! Decorative pieces workings was a colourful, glassy, vitreous material found on the of... Today in USA, and how much white marbling a piece colored sea glass cheap... Used to make glassware products and Jewelry minerals like basalt or diabase sowerby was popular! Natural Display piece 428 grams Opens in a variety of colours and was formerly chipped away melted. It has England was known as slagware or slag glass antique items can run anywhere in value from a percentage. Tulip slag glass created in recent years can come in many new colors considered... Glass-Like, glossy material akro Agate is an American company Washington Beck made molds for slag glass factories the! One indicator of AGE many new colors including orange, brown,,... Coloring and pattern make it perfect for statement decorations to dull and stony in appearance and when! 'S mark on the surfaces of slag when they are refined, turquoise, orange, pink and red properties. Some recent research here at USGS might change slags poor public image mixed into the.. And pattern make it perfect for statement decorations be worth more if is...