But what makes a slag glass lamp collectible, and how can you tell if you have a genuine antique? How to identify a slag glass lamp. CO. SLAG GLASS LAMP Base marked M.L. Many manufacturers used colored slag glass to create elaborate patterns in the lamp bases and shades, while others used the glass to create everyday scenes and landscapes. They may have additional insight or knowledge on identifying slag glass. Slag glass producers mark their products with the companys initials or the companys logo. [more like this] A pair of figural spelter oil lamps, with Slag glass has been used since the late 19th century and became popular during the Art Nouveau period in the early 20th century. Spelter Newel Post Lamp w/ Czech Glass, FRENCH ART DECO SPELTER FIGURAL LAMP, Circa. The marbling on originals will always be uneven and more creamy than white. The slag floats to the top, cools, and is collected to mix and make slag glass. Hanging Slag Glass Lamp, ca. The marbled effect is gorgeous on its own, but shining light through a complicated and colorful design is even more stunning. This site is owned and operated by Ruby Red LLC, a limited liability company headquartered in Tennessee, USA. Category 20th Century American Arts and Crafts Slag Glass Table Lamps The marbling is sometimes compared to tortoiseshell. Compare the texture, pattern, and color of the glass with known slag glass pieces to differentiate it from other types of opaque glass. Modern day slag glass manufacturers in the U.S. include Fenton, Mosser, Summit and Boyd Glass. George Davidson is believed to have made this brown buglein the late 19thcentury, one of the first pressed glass pieces known today. Sotheby's, New York, NY (December 2017) Estimate: $300,000 - $500,000. These patterns are created during the manufacturing process and give slag glass its unique appearance. Some well-known slag glass manufacturers include Sowerby, Davidson, and Greeners. 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. 1231C - 10 1/4 Ceramic Amber Tone Vase Lamp. Because of its rustic look, slag glass is often used in stained glass windows, lamps, and other decorative items. Happy hunting! Two glassmakers in Pennsylvania, Harry Northwood and Thomas Dugan, were the first to imitate slag glass by mixing two colors of glass together and forgoing the actual slag in 1902. Happy collecting! What Is Slag Glass? Rubber and vinyl coated wires were not used until the post-World War II era. Image 1: Tiffany Studios Hanging Head "Dragonfly" Floor Lamp. Challinor Taylor & Co. was one of the most prominent American Slag glass manufacturers. This$13,464 pair of slag glass lampson Etsy is one example, along with this complete setfrom the Hilltop Steakhouse in the United States, being sold for an even $15k on eBay. Brown malachite slag glass pieces are the rarest and most coveted colors of slag glass. If the glassware is marked by the manufacturer, you can use that to reverse search information about your piece. Examine the color. 1. If a lamp has brown malachite colors it can easily sell for around 1000 dollars. SHADE A vintage figural spelter table lamp, the depiction of a young man holding a cluster of grapes. There continues to be a vibrant market for antiques of all varieties due to their breathtaking beauty and exquisite designs. In this guide, well cover everything you need to know about slag glassfrom its history to how its made, what its worth, and how to identify a vintage piece. Slag is the byproduct of steel production. Related Posts: Plated Amberina - Rare, Colorful Art Glass Plated amberina glass, with color that graduates from amber to; Glass Paperweights You cannot fix a cracked snow dome paperweight. Sowerby was a popular producer of this blackberries and cream slag look. 6 Tips for Identifying Fenton Glass. You can determine the age of a piece of slag by finding the date of production. Slag glass antiques will not simply have white streaks blended with another color, but possess a richer, deeper tone. The colors of slag glass are also a great way to identify authenticity. It is a rather nice example of lamps of this type and I would place a value of $300 to $400. Slag glass is often cut and shaped by hand, leading to irregularities in shape. Known by various other names, slag glass is instantly recognizable by its opaque glass and smooth blend of colorful streaks, creating a distinct marble effect. Ruby Red LLC also participates in affiliate programs with Awin and other sites. Another common use for slag glass was for various lighting pieces. 2002-2023 LoveToKnow Media. Pictures of both the inside and outside of the lamp. Antique slag items are usually brown, blue, green or purple. Leave it in the comments below! Love Immortal: Antique Photographs and Stories of Dogs and Their People. As molten iron cools, a silicate slag forms on top of it. Its important to note that newer slag glass pieces may not have as much character or value as older ones. Vintage slag glass can be a collectors item, but contemporary versions are also extremely popular and thousands of items on still made today. In this case, the slag used for marbling glass is produced when iron is heated during the production process. Antique Slag Glass Lamp, 8 panel umbrella. LAMP SHADE - Leaded slag glass lamp shade, TABLE LAMP - A four panel, dark green slag. While it may not be as popular as other types of glass, slag glass is beautiful in its own way. It can also be called Malachite glass, in reference to the stone. However, its important to note that some sellers may falsely advertise a piece as slag glass, so do your research before making a purchase. Electrified with hanging chain, Arts and Crafts style hammered brass andArts and Crafts style hammered brass and slag glass lamp unmarked early 20th century; with green slag glass panels and reticulated shade square base 26 Brown with silky cream streaks was the first colorpalate of slag glass, and vintage pieces with this tint are some of the rarest and most valuable today. On the other hand, Tiffany Studios decorative items sold for several thousand dollars. For example, slag glass pieces with distinct marbling patterns or interesting shapes may be more valuable to collectors. If you're hoping to add some historic charm to your home, antique chandeliers can be a wonderful choice. To determine if an item is true slag glass or if its a combination of two molten glasses, consult a vintage glass appraiser. Examine the lamp base and verify that it has a real bronze finish. . This mark is usually made at the bottom of the lamp. Slag is a somewhat unusual word, and unless you really know your glassware, the term Slag Glass probably wont ring a sort of bell at first. A similar look was created around the same time by U.S. manufacturers Northwood and Dugan. Hobnail glass was popular in Victorian times, then, it was called "dewdrop glass." When Fenton introduced it in 1939, it became a hit. Identifying Slag Glass. $1,551 57% Off $3,600. Two vintage brown Sowerby figurines can sell for two completely different processes depending on how the marbling came out. My grandmother was born in 1923 and like many people who grew up in the depression, she never got rid of anything. Performance & security by Cloudflare. The action you just performed triggered the security solution. By clicking Accept, you agree to our website's cookie use as described in our Cookie Policy. She added custard glass to the company's color line in 1969 and iridescent (carnival) in 1972. Most companies have halted the production of slag glass items altogether. Atterbury & Company, Challinor Taylor & Company, and H. Northwood Glass Company are some well-known manufacturers from the United States. If you cant see any light passing through, the glass may be frosted or pressed glass instead of slag glass. Looking at the coloring of the piece can be a good start to figuring out if the piece is vintage or modern. ALL RIGHT RESERVED. Add To Cart Description. Your lamp appears to have six panels and looks to be in very good condition. EMPIRE LAMP CO. SLAG GLASS LAMP bronze base marked 'Empire Lamp M.L. Some later manufacturers include Boyd, Imperial, and Westmoreland. At first they painted glass blanks from other glass makers, but started making their own glass when they became unable to buy the materials they needed. Both beautiful and elegant in their own regard, stained and slag glass are actually completely different. ART DECO FIGURAL LAMP WITH ART GLASS SHADE: An oil burning lamp raised on a brass fluted. Fenton produced quality glass, so you should not find any defects like bumps or air bubbles . Save my name, email, and website in this browser for the next time I comment. Popular slag glass lampshades shapes included mushroom, dome and flower petals. But before you buy or start working with slag glass, it is important to know how to identify it correctly. 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. The value of vintage slag glass, as with any antique, will depend on the quality of its condition, time period, and most importantly, the manufacturer. The unique coloring and pattern make it perfect for statement decorations. Your caramel slag glass paneled lamp dates from the 1910s through the 1920s. They still wanted the white streaks, and so they mixed purple glass with a white, opal-y, colored glass. There are three ways to differentiate vintage slag or mosaic glass from modern iterations: 1)Examine the marbling pattern: While both new and older pieces will have a marble look, its certainly not enough to spot an antique. Purple is the most common slag glass color. Avon calling. These are 2" in diameter at the fitters, and 1 . As always, make sure to do your due diligence when buying or selling any antique, and remember there are many free online appraisal sitesyou can consult as well. Slag is used to refer to the by-product that shows up when various ores and metals are smelted. rim, lamp is 20'' long x 11'' long. column support set beneath an opaque glass fount with painted silhouette bird and foliate detail and with a spherical etched glass shade and clear glass chimney together with search our price guide for your own treasures. Color, age, and manufacturer are definitely important in determining the value of a vintage piece. The history of slag glass goes back to the late 1890s in Gateshead in the northeast of England. 4. Look for age-related wear or markings on accompanying hardware, such as lamps or furniture. Accept Read More, We hand-pick antiques for our readers and may, Popular Glass of the 19th and 20th Centuries: A Collectors Guide (Millers Collectors Guides), Most Popular Vintage Corning Ware Patterns (and Price Ranges), Antique Price Guide with Pictures: A Look at Antiques Worth Money, The Best Antique Price Guide Books for Appraising, Blue Willow China: All About This Timeless Classic, Flexible Flyer Sleds: A Closer Look at History, Value, and Quality, What Is Carnival Glass? 73- Important Duffner and Kimberly leaded lamp. Over time, other companies like Imperial Glass, Akro Agate, and Westmoreland began producing and selling their own versions of slag glass. Identifying Silhouette Slag Glass Lamp In Antique American Lighting, Antiques, Uncategorized on February 8, 2016 at 7:02 pm. He has extensive experience in the field of buying and selling antiques and collectibles. Look for labels indicating the glass is made from recycled materials, such as Cinderella or marble glass.. Add your item here. Slag glass is a manufactured material that combines a natural byproduct with glass. If it feels bumpy or uneven, its likely slag glass. Look out for its bases and edges 4. These tips and tricks can help to ensure further that a piece is indeed slag glass. It can seem strange to think of putting metal byproducts into a beautiful piece of glass, but it is super common to use a wide selection of additives and compounds to give glassware unique looks. Glassmakers have achieved a similar-looking marbled effect to slag by simply mixing two different colors of glass together. Despite its rarity, you can still find slag glass items in modern homes. The Pittsburgh Lamp, Brass & Glass Company was assigned at least five lighting-related patents between August 28, 1900 and March 21, 1916. Topped by an Art Deco style marbled yellow art glass shade. The marbling is sometimes compared to tortoiseshell. A reader sent me the above photograph with a request that I identify the above lamp. His masterpiece is the Lutheran Ludwig's Church, which stands at the centre of a rectangular plaza. Challinor would instead combine two colors of molten glass. Whether you just found the slag glass table lamp of the century in the back barn or at an estate sale. Save my name, email, and website in this browser for the next time I comment. Happy collecting! This pattern looks like clouds or waves and can range from subtle to bold. Original 1910-1920's slag glass lamp, shows one cracked glass REVERE Copper and slag glass lamp, its faceted shade with green LAMP SHADE - Leaded slag glass lamp shade, unsigned, with TABLE LAMP - A four panel, dark green slag glass lamp with VINTAGE SLAG GLASS LAMP All original wiring, Circa 1920s, Size: 22 Slag Glass Lamp, figural spelter base with couple. Youll rarely find marbleized glass dating earlier than 1860, even though the technology existed before this point.2. Note the glass type 5. Vintage Swag Green Slag with Amber Glass Drop Light, Pendant Hanging Lamp . Vintage slag glass is a lot more restrictive in color options than recently produced pieces are. 17 1/2" diameter 24" high. Depending on the rarity of the item, slag glass is worth anywhere from $50 to $1500. You can email the site owner to let them know you were blocked. Thanks for reading! Tiffany . An avid antiques collector herself, Kate has written about antiques for many years. 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. If they look and feel smooth and consistent, it was likely machine painted. Become a national Fenton club member Fenton glassware prices 1. Delivery from Downers Grove, IL 7-14 days Edit my Location. They bring a sense of the past into a home and they add a pop of color. The mosaic glass created in Pittsburgh was a mixture of purple and either white or an opal shade. The smooth, uneven swirls enveloping the glassware give slag glass an unmistakably look, with no two ever being quite the same. The price of slag glass ranges considerably from five dollars for small slag glass pieces, to antiques that would garner hundredsif not thousands of dollars. The three lights retains their 1930s; verdigris patinated spelter female nude dancer, on new Donegan cast iron step base, one arm supports, light with frosted glass globe, 22 in. This slag is predominantly binary compoundsof elements such as silicon, sulphur, and aluminium reacting with the sides of foundry molds. Caramel colored slag glass lamp shade on light brown painted foliate design two lighted lamp base with pull chains, no marks found. Rainaud, and Tiffany Studios. You can determine antique slag glass with a few steps: Slag glass antique items can run anywhere in value from a low of $50 to a high of $1,500. Vintage lamps will show typical signs of aging, such as patina on the metal . Dont confuse newer pieces with older, vintage ones. Check out nostalgic collectibles from one of America's most successful direct sales companies. Instead, the glassmaking duo from Pennsylvania combined two colors of molten glassone white and one opaqueto create the same marbled effect. When looking to purchase real slag glass, look for the marks of the manufacturer. Price Guides! Sowerby in Gateshead, England is believed to be the first glass foundry to create slag glass. 2. 1230C - 10 1/4 Ceramic Green Tone Vase Lamp. The lustrous glass often had threads of glass in contrasting colors pulled through the surface to form a feather shape. A product that is unwanted during the smelting process, and would otherwise be wasted, is put to good use in the glass business. Tiffany Floor Lamps. Look for any imperfections or bubbles in the glass, which can indicate it is not true slag glass. It has distinctive a distinctive knob pattern and comes in a variety of colors. Because slag glass is made from recycled materials, it often contains small bubbles or imperfections on its surface. The company, based in Jeannette, Pennsylvania, rebranded in 1898 and took on the name Jeannette Glassware. antique chandelier lamp parts, ornate embossed brass bobeches for lights. It should not have white streaks mixed into the color, nor should it be one solid color. Figural Spelter Lamp, boy holding a cornucopia, ART DECO FIGURAL MAIDEN TABLE LAMP: Patinated, ORIENTALIST AUSTRIAN COLD PAINTED SPELTER, Sgd. Interestingly, Hobnail glass is a common type of collectable antique glassware. Most antique slag items are brown, blue, green, or purple. A few examples of modern glass manufacturers operating out of the US today are Boyd Glass, Mosser, and Summit. Eventually, it became known as slagware or slag glass. eBay (258) Magazine. On the other hand, slag glass can easily leave people confused. Arts and Crafts Limbert Style Slag Glass Lamp Slag glass created in recent years can come in many new colors including orange, pink and red. Companies continued to make slag glass items well into the mid-20th century. Price Realized: $550,000. Handel lamps with metal overlays over slag glass are from the company's "Teroca Ware" line. Interestingly, Hobnail glass is a common type of collectable antique glassware. White melts into a pale lavender when it intersects with the opaque purple. I'm Stacy Jones and I love antiques! Happy searching for your favorite color of slag glass! Pieces from well-known manufacturers or in rare colors may fetch a higher price. The marbling should be a creamy white color that is evenly mixed into the base color. Show & Tell. Tiffany lamps are famous for the vibrant colors and varied textures used in the glass design. Then, gently wash the piece using warm water and mild soap. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. Dr. Anthony J. Cavo is an honors graduate of the Asheford Institute of Antiques and a graduate of Reisch College of Auctioneering. The number of broken pieces. One clear indicator, though, of true slag glass is the richness of its tonal variations: real slag glass will not simply bear streaks of color but instead will offer more subtle variations in opacity and tone like one would expect from marble or alabaster. Have you ever wondered what someone meant by slag glass? Generally only old lamps feature a brass collar. Lampshades and chandeliers were commonly produced out of slag glass. These colors are created through different repurposing techniques. Most pieces are decorative in nature, sprucing up side tables and bookshelves. Take care not to break or damage the piece while examining it. True slag glass was originally produced in England during the last quarter of the 19th century when, simply put, it is believed slag from iron-smelting was added to molten glass to achieve a marbling effect in a variety of colors. This is the most obvious giveaway when trying to spot slag glass. This guide will explain how slag glass was made, when it was popular, and what its worth. Prof. Busch working group is focused on solid metallic glass and biomaterials. This type of art glass is highly sought after by collectors, so its definitely worth taking the time to learn how to identify it. The value of slag glass items can also be determined by the condition of the item. Your caramel slag glass paneled lamp dates from the 1910s through the 1920s. If possible, consult a knowledgeable collector or visit an antique store to verify authenticity. Verna Mae Wright died in 1990. 30 slag glass lamps for sale; 401-314-6005 (12-6 ESTime) non text# Email pictures to: Len.Daley@yahoo.com. Real slag glass will not have a solid color but rather a blended, marble look. Included one glass screen with crack with figures of 2 seated nude maidens either side of center lamp with multi-color glass globe shade, no visible markings. If you're a collector of antique lighting, you've likely come across slag glass lamps. 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. The marbled pattern and swirled appearance of the glass add to its unique appeal and character. Slag glass can be easily confused with other types of opaque glass, such as frosted or flashed glass. She has also managed an online antiques community. Ph.D. antiques appraiser Dr. Lori reveals tips to tell if the piece you think might be Tiffany glass is really slag glass used for that lamp shade or other p. 7 Avon Collectible Bottles Worth Thrifting. Slag glass is a man-made opaque base glass with marbelized swirls in a different color. Unsigned decorative glass items like compotes and vases tend to sell between $5 $50, even if they are from the 19th century. Polly Pocket: History & Value of Barbies Biggest 90s Rival. From Art Deco to 1970s Contemporary, we tried to list as many lamp manufacturers as we could find. They're easy to find, and make a colorful, decorative display in your home, offi, What Is Vaseline Glass? Markings for Bigelow and Kinnard, Kramer, Steuben, Bradley and Hubbard, Stickley, Gorham . Antique Slag Glass Lamps. The marbling should be a creamy white color that is evenly mixed into the base color. The company, based in Jeannette, Pennsylvania, rebranded in 1898 and took on the name Jeannette Glassware. 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. The key to determining if a piece of glass is "true" slag or just a handsome example of pressed glass is to look for glass that is obviously and richly marbled rather than simply colored or streaked. Sowerby also created several other color formulas including Giallo (yellow), Pomona (green), and Sorbini (blue). This created the marbled effect and bright variations in color that make slag glass so unique. Slag glass also has a rough texture compared to other glass types. Happy cleaning! There are several things to keep in mind when looking to identify whether something is slag glass or not. Always do your research and be cautious when purchasing or collecting slag glass. An Identification Guide for Beginners, Atlas Mason Jar Identification and Value Guide, Vases, Compote, Creamer, and Bowls, Lot of 7. If you suspect that the piece may be vintage, check for age-related wear or markings on the glass itself or any accompanying hardware, such as lamps or furniture. Have you ever seen a piece of glass and wondered where it came from? I grew up going to antique stores and markets with my mom and grandmother. In the early 20thcentury, Thomas Dugan and Harry Northwood were the first to make imitation slag glass, called mosaic glass. Production of slag glass originated in late-19th-century England, where glass manufacturers are thought to have added slag from iron-smelting works to molten glass to create a range of effectsfrom tortoiseshell to marbling. Manufacturers used the glass in molds to make bowls, compotes, vases, plant cache pots, and more. Slag glass can come in a range of colors, including shades of green, brown, pink, blue, and purple. [more like this] FIGURAL SLAG GLASS TABLE LAMP: Patinated spelter figure of a standing woman on art nouveau style base, double socket fixture, no visible makers mark, 23 3/4'' h. x 7 1/2''. The strict definition of slag glass means that it has powdered silicate slag from iron smelting mixed into the glass to create streaks. A Hanging Slag Glass Lamp, circa 20th Century Six sides of milky slag glass in a metal frame with a copper finish. While collectible, the price range varies greatly depending on the item and manufacturer. Additionally, the uniqueness and character of each individual piece can also affect its value. Some of these names can be used synonymously, but some of them have slightly different meanings that a serious collector should be aware of. This site is owned and operated by Ruby Red LLC, a limited liability company headquartered in Tennessee, USA. The dimensions Length x Height. Instead of slag, they mixed purple glass with a white-colored glass that did not contain any iron slag. Some handmade collector marbles are small works of art that can command big prices. Slag glass of other colors is unlikely to be an antique. Your IP address cannot be used to identify you. These are just a few of the companies that produce authentic slag glass. A more specific title for this type of glass would be mosaic glass. 1230A - 10 1/4 Alpha Art Glass Green Vase Lamp. Oftentimes the pieces labeled as variegated glass have more stripey streaks in contrast to the more organic swirls of a true marble pattern. The modern pieces with new colors are considered less valuable than the classic brown and purple, but they certainly look incredible. Opalescent or iridescent glass can be worth more. Click to reveal If you're examining a glass kerosene lamp, look for a brass collar. Designers would create intricate stained glass style patterns and scenes within lampshades. France, Late 19th Century. Stepped marble LAMPS.Two antique Czech glass fruit basket boudoir lamps., Cast spelter metal bases with figural handles, (one pair of handles as is). Very similar to the photo on page 182 of Paul Crist's book. Slag glass is no longer produced as it once was. Slag glass was extremely popular when used to create lampshades. This material takes on different colors depending on the minerals and elements that are present in the iron. The molten glass is placed into forms and then pressed to get the right shape and emboss the surface with a pattern. Two of these patents, numbers 656891 and 774602, clearly depict the SUCCESS burner in their accompanying patent drawing. Would anyone know the company that might of cast this lamp base? This being the glass version rather than stone, it makes sense to call it how you . Telling slag glass apart from other styles is actually quite simple.

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