These almost always sell in the thousands, but to fans of Tiffany's work rather than to glass collectors. 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. The major phases of ferrous slag contain calcium-rich olivine-group silicates and melilite-group silicates. Once you find those marks, research the company to see if they are an authentic brand. 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. 12. SOLD FEB 14, 2023. You can determine the age of a piece of slag by finding the date of production. 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. The marbling should be a creamy white color that is evenly mixed into the base color. Slags often have very rough exteriors, unlike any stony meteorite. [5], Non-ferrous slag is produced from non-ferrous metals of natural ores. In this case, the slag is termed synthetic. 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). I'm Stacy Jones and I love antiques! Slag Glass is an industrial waste product that can look surprisingly similar to obsidian, a volcanic glass. Typically slag glass antiques will be vases, dishes, bowls and decorative figurines and picture frames. A slag driveway can withstand the weight and friction of vehicles for up to 60 years, without needing maintenance. Most homes in the late 19th century and even some older homes today could be found using a slag glass lampshade as decor. One of the most common applications of vintage slag glass is in lighting. Condition. Fenton Art Glass Identification and Value Guide. or Best Offer +$8.95 shipping. Utilization of slags in the construction industry dates back to the 1800s, where BF slags were used to build roads, and railroad ballast. Slag glass is a type of pressed glass that is known for its brilliant and vibrant colors. Slag glass is the opaque pressed glass that has streaks of color within it. Slag Glass prices range from 50 dollars to 1500 dollars. If the glassware is marked by the manufacturer, you can use that to reverse search information about your piece. Vintage slag glass is most commonly found in brown or purple colors with white streaks, but you can also find plenty of green and blue as well. If there are other, brightly-colored crystals or grains in the rock, it is probably not a meteorite, but many slag products do contain a variety of bright-colored crystals and fragments. Natural Slag Glass - Etsy Natural Slag Glass (1 - 40 of 148 results) Price ($) Shipping Leland Blue Crumbles - Tumbled - Slag Glass - Crafts - Jewelry Making LakeshoreStonesLLC (2,149) $15.00 AAA Whole lot for 3 pieces Top Blue Slag Copper Oval Cabochon | Natural Blue Slag Copper Cabochon | Blue Slag Copper Oval Stone PATILCREATION (60) Ruby Red LLC is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. 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. They are a great way to add color to any room. Parsons' studies identify dissolution of the glassy material in the slag as the major source of potentially toxic metals released to the environment. A slag by-product of such workings was a colorful, glassy material found on the surfaces of slag from ancient copper foundries. These beautiful old light fixtures can also be incredibly valuable, so knowing how to spot a, Collector Marbles: A Basic Guide to Types and Values. In many smelting processes, oxides are introduced to control the slag chemistry, assisting in the removal of impurities and protecting the furnace refractory lining from excessive wear. Some of the most popular manufacturers were Miller, Bradley & Hubbard, Empire Lamp Manufacturing Company, Pittsburgh Lamp, Brass and Glass Company, H.E. Featured Refinements: Slag Glass Rock - Remove Filter; Featured Refinements. As with many other types of vintage glassware, the slag glass technique can be found in all sorts of different pieces, decorative or functional. Real slag will always have a creamy marble effect. 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. or Best Offer. Designers would create intricate stained glass style patterns and scenes within lampshades. When iron-ore is smelting during steel production, the remaining residue is a glass-like, glossy material. Some of these names can be used synonymously, but some of them have slightly different meanings that a serious collector should be aware of. Ruby Red LLC is compensated for referring traffic and business to these companies. Antique Purple and White Slag Glass Cake Stand, Antique EF Industries Green Slag Glass Table Lamp. This would still give the marble effect without the use of actual slag. Magnetic: Since most meteorites contain metallic iron, a magnet will often stick to them. Slag glass was first created in England in the 1880s as an opaque brown with white streaks from iron slag. The result is a material that lies somewhere between porcelain and glass. A similar look can be produced using multiple colors of glass mixed together, each individually colored using various compounds. [4]. 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. There are three types of slag: ferrous, ferroalloy, non-ferrous slags, which are produced through different smelting processes. [17][18] Across these CCS methods, slags can be transformed into precipitated calcium carbonates to be used in the plastic, and concrete industries and leached for metals to be used in the electronic industries. Where the slag is really concentrated it will appear milky white. Slag glass is pressed and untempered glassware, much like depression glass. This is one of the most common uses for slag glass, and you'll see many slag glass chandeliers and other fixtures in antique shops. I enjoyed learning about items she grew up with and collected throughout the years, and recognizing similar items when we would go antique shopping. SOLD FEB 10, 2023. Meanwhile, the exploitation of gravel is restricted with the implementation of ecological environment protection, resulting in the lack . Slag glass is no longer produced as it once was. Slag glass stands out from other types of glass antiques for the beautiful marbleized color patterns. Slag is the collection of compounds that are removed. This marbling is one of the best ways to identify slag glass. "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. 24. Slags may be magnetic and metallic, but will have many vesicles or holes (Above right). This mark is usually made at the bottom of the lamp. 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. $6.99. Vintage Salvage Slag Glass Metal Porch Light Fixtures Outdoor Lamp SconceDamage. Top Rated Plus. ft. 509 E Colgate Dr, Tempe, AZ 85283 $315,000 MLS# 6521840 Don't miss this incredible opportunity to own a newly renovated townhouse with 2-car carport . 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. The most effective method to detoxify alkaline ground water discharge is air sparging. The value of slag glass antiques ranges from $20 $20,000. [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. Some of the other names for slag glass come from its historical beginnings. Tiffany Studios also made objects such as picture frames, desk sets, and decorative boxes made with slag glass. Ruby Red LLC also participates in affiliate programs with Awin and other sites. It was primarily blue or green and was formerly chipped away and melted down to make glassware products and jewelry. Slag is composed primarily of silica and lime, with concentrations of other minor constituents, including alumina, magnesia, and other compounds. Here's an example of a Radium-painted watch hand in a cloud chamber. The first pressed glass pieces that collectors refer to as "slag glass" were made in the 1890s, using the glass-like by-product of iron ore known asyou guessed itslag. It is hard to keep fragile glass intact for decades. The acid then dissolves other metals and can contaminate drinking water, disrupt the growth and reproduction of aquatic plants and animals, and even corrode parts of infrastructures such as bridges. This website uses cookies to improve your experience. Slag glass gets its name from slag. The colors of slag glass are also a great way to identify authenticity. It will always be an opaque color with lots of white or creamy colored swirling. Tiffany, Roycroft or Steuben lampshades made with slag glass can command prices of up to $20,000. As the slag is cooled down by water, several chemical reactions from a temperature of around 2,600F (1,430C) (such as oxidization) taken place within the slag. Antique Works and Values, Antique Glass and China Types, Values & Histories. Ferrous slag is currently underutilized. Antique slag items are usually brown, blue, green or purple. "frit", a high density, vitreous, and abrasive material low in carbon and formed in various shapes from jagged and irregular pieces to rod and needle-like forms) and residual carbon char, the proportions of which vary depending on operating conditions, gasifier, Slags catch people attention because of their morphology. One of the uses for Blue Slag Glass is to help connect to higher energies and . A piece of slag glass will be worth more if it is a rare color or a rare item. In many smelting processes, oxides are introduced to control the slag chemistry, assisting in the removal of impurities and protecting the furnace refractory lining from excessive wear. American company Washington Beck made molds for slag glass factories in the United States and England in the mid- to late-1800s. Lighting FixturesPettingell-Andrews Company, c. 1910, Gas and Electric LampsWelsbach Company, c. 1910. How do you identify glass slag rocks? Real slag glass will not have a solid color but rather a blended, marble look. I grew up going to antique stores and markets with my mom and grandmother. Another way to determine if a piece is vintage or not is identifying the manufacturer and date, although that can also prove to be a difficult mission at times. Slag is also used as aggregate in asphalt concrete for paving roads. 2022 HEIRLOOMS AT HOME & AGELESS HEIRLOOMS. However, the most important application is construction. If a lamp has brown malachite colors it can easily sell for around 1000 dollars. Kellyco Metal Detectors posted on eBay that it can sell for $300 per gram or more meaning 1 pound could be worth $1 million. 611 3357 Yong Plain, West Audra, IL 70053, Hobby: Embroidery, Creative writing, Shopping, Driving, Stand-up comedy, Coffee roasting, Scrapbooking. (817) 251-1668. In fact, some pieces marked as Sowerbyslag glass made in England look very much like pieces that were made in the United States during the early years. American company Washington Beck made molds for slag glass factories in the United States and England in the mid- to late-1800s. As molten iron cools, a silicate slag forms on top of it. Looking at the color, and how much white marbling a piece has, is one indicator of age. It has distinctive a distinctive knob pattern and comes in a variety of colors. 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. How do you grind glass without a grinder? . Slag that has a low percentage of alumina to silica becomes glassier, and rapid cooling also makes it more glasslike. It should not have white streaks mixed into the color, nor should it be one solid color. The marbling is sometimes compared to tortoiseshell. One item where slag glass was used often was in the creation of antique oil lamps, chandeliers and lampshades, particularly during the Art Deco and Art Nouveau periods during the late 19th and early 20th century. It may also have higher free CaO and MgO content, which are often converted to its hydrated forms if excessive volume expansions are not desired. Slag Glass Rock filter applied; see all. Its only raw material is a very specific slag that is a by-product from the blast-furnaces manufacturing iron. The ideal thickness of each layer is between 4 to 6 inches. The consistent yet subtle pattern gives Slate Grey-N added character to an otherwise plain background. My grandmother was born in 1923 and like many people who grew up in the depression, she never got rid of anything. Now, you can find slag glass pieces in practically any color. You'll find slag glass in blues, browns, and greens as well, though these colors are rarer than the brown/white/cream and purple formulations. 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. Hard and durable, steel slag makes a perfect aggregate for covering parking lots, achieving a lasting result. Vintage slag glass is a lot more restrictive in color options than recently produced pieces are. Jeannette Glassware, originally Jeannette Bottle Works, was founded in 1888. Without advertising income, we can't keep making this site awesome for you. It was also ground into powder to add to glazes for use in ceramics. Slag glass lamps are one of the most sought-after items made of slag glass. For example, manufacturers also made slag glass by mixing metal oxides with enamel glass. [21] To this end, some have proposed performing a series of experiments testing the reactivity of a specific slag material (i.e., dissolution) or utilizing the topological constraint theory (TCT) to account for its complex chemical network. Despite its rarity, you can still find slag glass items in modern homes. Metal furnace slag can range from glassy to dull and stony in appearance and, when scratched, can range from hard to chalky. The value of slag glass is determined by the rarity of the item and the color. Is slag environmentally friendly? Thesecoveted decorative accessories are not as common as other decorative objects made of slag glass, however. If the base color is brown, purple, blue, or green theres a decent chance that it is a vintage make. Sowerby in Gateshead, England is believed to be the first glass foundry to create slag glass. Anyone will have a pretty good idea of what youre talking about if you say marble glass even if they arent interested in collecting. Purple is the most common slag glass color. If the item is in good condition, with no cracks, discoloration, or signs of neglect, it will be worth more. 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. Fenton, Mosser, Boyd Glass, and Summit are some of the common, modern, U.S. manufacturers of slag glass. Serious antique glass collectors will be familiar with "slag glass" which became popular in the late 1800s and is still made today. Manufacturers experimented with different methods to achieve this malachite-like look. The name slag glass comes from the composition of the materials used to make the glass. 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. Pre-Owned. For todays collectors, slag glass is a greatly sought-after item that can go for a lot of money. However, ferrous and ferroalloy slags may also have them, which raises concerns about highly weathered slag dumps and upcycled materials. Episode 15, (Video) How To Identify Slag Glass by Dr. Lori, (Video) Incredible Blue Slag Spill: Searching for the Rarest, (Video) Iron ore slag jewelry from Shenandoah Valley VA, (Video) Bulk Slag Glass Unboxing, Initial Processing, (Video) Crushing Glass Slag to get Gold , (Video) brushing CHEAP concrete onto a gravel driveway (adding strength and resilience), (Video) Junkyard Flintknapping - "Federal Law Forbids Re-Use of This Bottle." Challinor created slag glass slightly differently than the original process which uses true slag. This does use the broader definition of slag glass that includes white marbling produced through any method. Iron meteorites are dense and therefore heavier for their size than most naturally-occurring rocks. I have found sea slag glass that is black, brown, grey, green, yellow, blue and any of those shades in between. Fiberglass insulation is made from molten glass that is spun or blown into fibers. 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. Sometimes hard rock mining can give the environment a bit of excess acid, in the form of acid mine drainage. Slag glass is an unfortunate name for glass, often beautifully coloured, that is a by-product of metal ore smelting processes. I enjoyed learning about items she grew up with and collected throughout the years, and recognizing similar items when we would go antique shopping. Longer produced as it once was Lamp SconceDamage multiple colors of glass mixed together, each individually colored using compounds. Stick to them decorative figurines and picture frames and melted down to make the glass material that lies somewhere porcelain! Workings was a colorful, glassy material in the United States and England in the form acid! 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Piece of slag glass Rock - Remove Filter ; featured Refinements, which are produced through any method melted. Upcycled materials make glassware products and jewelry streaks of color within it is in condition!