Stretch Glass: Iridescent Art Glass from the American Pressed Glass Era
Stretch glass is a type of iridescent pressed glassware produced by American glass companies primarily between 1916 and 1935. The distinctive stretched or onionskin iridescent surface is created by spraying hot glass with metallic salts, typically stannous chloride, and then reheating and reshaping the piece, which causes the iridescent coating to stretch and develop a characteristic crinkled texture.
This process distinguishes stretch glass from carnival glass, which receives its iridescent spray after final shaping and thus has a smooth, uniform iridescent surface. The major producers of stretch glass include Fenton Art Glass, Northwood Glass, Diamond Glass-Ware (formerly Dugan), Imperial Glass, Lancaster Glass, Central Glass Works, Vineland Flint Glass Works, and the United States Glass Company.
Identification and Maker Marks
Most stretch glass is not marked with a manufacturer's stamp, making identification dependent on recognizing specific shapes, colors, and production characteristics associated with each maker.
Fenton produced the widest variety of stretch glass forms and colors, including their well-known Velva Rose (pink), Celeste Blue, Florentine Green, Topaz, and Wistaria (purple). Northwood stretch glass is sometimes found with the company's distinctive underlined capital "N" mark.
Imperial's stretch glass often appears in their signature Pearl Green and Pearl Amethyst. Diamond/Dugan pieces tend to have a heavier, chunkier feel compared to Fenton's more refined forms.
Key identification features include the texture of the iridescent surface (which should show visible stretching or wrinkling), the base shape and snap marks, the color of the base glass visible through the iridescence, and the specific mold patterns used by each manufacturer.
Comparing pieces against documented shapes in reference guides is the most reliable attribution method. Ground or polished pontil marks versus snap marks can help narrow the manufacturer and date.
Types and Forms
Stretch glass was produced in a wide range of tableware and decorative forms. Console sets consisting of a centerpiece bowl with matching candlesticks are among the most popular collecting categories.
Comports, bon-bon dishes, plates, sherbet dishes, vases, and candy jars were produced in quantity. Specialty forms include dolphin-handled pieces, fan vases, nut dishes, guest sets, and cheese-and-cracker servers.
Color is a primary collecting focus. The most common stretch glass colors are marigold, blue, green, amethyst, and clear. Rarer colors that command premiums include Wistaria, Celeste Blue, red, tangerine, aquamarine, Florentine Green, and Velva Rose.
Some manufacturers produced experimental or limited-run colors that appear very seldom and are eagerly sought. Two-toned or cased stretch glass, where the iridescent exterior overlays a different base color, represents an uncommon and desirable variant.
Price Ranges
| Category | Description | Typical Price Range |
|---|---|---|
| Console sets (common colors) | Bowl with pair of candlesticks | $40 - $150 |
| Console sets (rare colors) | Wistaria, Celeste Blue, red | $150 - $600 |
| Dolphin-handled pieces | Comports, bon-bons, candlesticks | $50 - $300 |
| Vases (common colors) | Fan vases, bud vases | $20 - $80 |
| Vases (rare forms or colors) | Large sizes, unusual shapes | $75 - $400 |
| Comports and bon-bons | Standard forms, common colors | $15 - $60 |
| Plates and sherbet dishes | Table service pieces | $10 - $40 |
| Candy jars with lids | Covered containers | $30 - $120 |
| Guest sets | Tumbler and carafe or pitcher | $40 - $175 |
| Northwood marked pieces | Verified "N" mark examples | $50 - $250 |
| Experimental or rare colors | Red, tangerine, aquamarine | $100 - $500+ |
Condition Factors
The iridescent surface is the defining feature of stretch glass, and its condition is the most critical factor in valuation. Scratching, wear, or loss of iridescence from washing, stacking, or abrasion substantially reduces value.
Examine the surface in natural light at an angle to assess the completeness and quality of the iridescent coating. Pieces with strong, vivid iridescence across all surfaces are most desirable.
Check for chips, particularly on rims, feet, and handles. Small nicks on the underside of bases are common and generally tolerated, but rim chips are more detrimental.
Cracks of any kind, including stress cracks around handles and bases, significantly reduce value. Manufacturing flaws such as bubbles, straw marks, and minor mold lines are expected in pressed glass of this era and do not typically affect value.
For covered pieces such as candy jars, confirm that the lid is original to the base by checking color match and fit.
Collecting Tips
Begin by studying the comprehensive reference works on stretch glass, particularly those published by the Stretch Glass Society, which has documented forms, colors, and manufacturers in detail. Membership in the Stretch Glass Society provides access to identification resources, experienced collectors, and specialized shows.
Learn to distinguish stretch glass from carnival glass by examining the iridescent surface texture. Stretch glass has a visibly wrinkled or crinkled iridescent layer, while carnival glass is smooth. This distinction is important because values and collector communities differ significantly between the two categories.
Focus on acquiring pieces in excellent condition with strong iridescence, as condition drives value more than form in the stretch glass market. Rare colors and unusual forms offer the best appreciation potential.
Shop at glass shows, estate sales, and auctions where pieces can be examined in person, as photographs often fail to accurately capture iridescent quality. Complete console sets are worth more than their individual components and make visually impressive display pieces.
When building a collection, consider specializing by manufacturer, color, or form to develop focused expertise.