Glass: Antique & Collectible Glassware
Glass collecting is one of the broadest and most accessible areas of the antiques market, encompassing thousands of patterns, makers, and styles produced over 3,500 years of glassmaking history. From ancient Roman unguentaria to Depression-era tableware, from Sandwich glass to Steuben crystal, the category offers entry points at every price level. Understanding glass composition, production methods, and maker characteristics is essential for accurate identification and valuation.
Glass Composition Types
| Type | Composition | Characteristics | Period |
|---|---|---|---|
| Soda-lime | Sand, soda ash, lime | Most common; slightly green tint | Ancient-present |
| Lead crystal | 24-33% lead oxide | Heavy, brilliant, bell tone | 1670s-present |
| Flint glass | Lead oxide formula | American term for lead crystal | 1770s-1900s |
| Borosilicate | Silica with boron oxide | Heat resistant, clear | 1880s-present |
| Milk glass | Tin or bone ash opacifier | Opaque white | 1500s-present |
| Carnival | Press-molded, iridized | Metallic spray coating | 1907-1930s |
| Depression | Machine-pressed, colored | Mass-produced tableware | 1929-1940s |
Major American Glass Factories
- Boston & Sandwich Glass Co. (1825-1888): Lacy pressed glass, overlay, art glass
- New England Glass Co. (1818-1888): Cut, pressed, and art glass; later became Libbey
- Bakewell, Pears & Co. (1808-1882): Pittsburgh's premier cut glass firm
- Steuben Glass Works (1903-2011): Founded by Frederick Carder; aurene, colored art glass, later clear crystal
- Fenton Art Glass (1905-2011): Carnival glass, hobnail, hand-painted decorative ware
- Heisey Glass (1896-1957): Elegant pressed and blown tableware, figural animals
Collecting Categories & Price Ranges
| Category | Entry Level | Mid Range | High End |
|---|---|---|---|
| Depression glass | $5 | $30 | $200 |
| Carnival glass | $10 | $75 | $5,000+ |
| Pattern glass (EAPG) | $15 | $60 | $500 |
| Elegant glass (1920s-1950s) | $20 | $75 | $400 |
| Art glass (Victorian) | $75 | $500 | $10,000+ |
| Cut glass (Brilliant Period) | $50 | $400 | $5,000 |
| Early American blown | $100 | $800 | $20,000+ |
Identification Basics
- Mold seams: Location and character indicate production method and approximate age
- Pontil marks: Open, ground, or polished pontils help date blown glass
- UV fluorescence: Manganese glass glows green; uranium glass glows bright green/yellow; lead glass appears blue-white
- Weight: Lead crystal is substantially heavier than soda-lime glass of similar size
- Color: Certain colors are associated with specific periods and makers
- Maker's marks: Many firms used acid-etched, molded, or applied labels
Condition Factors
- Chips and cracks: The most common damage; minor rim chips may be acceptable on early pieces but devastating on later glass
- Cloudiness: Sick glass (alkali leaching) produces permanent internal hazing
- Staining: Mineral deposits inside vessels from water or other liquids
- Wear marks: Base scratches and surface dulling from use
- Repairs: UV light reveals most adhesive repairs and filled chips
Collecting Tips
- Start with one category and learn it thoroughly before branching out
- Reference books remain essential: Bredehoft, Heacock, Florence, and Measell are foundational authors
- Color and form drive value; unusual colors in common patterns command premiums
- Reproductions exist in every category; studying originals in museum collections builds connoisseurship
- Glass shows and conventions offer the best opportunities to examine, compare, and learn
- Condition standards vary by age: 18th-century glass may have acceptable flaws that would be disqualifying in 20th-century production