Clambroth: Translucent White Pressed Glass

Clambroth is a type of pressed glass characterized by its distinctive semi-opaque, grayish-white color that resembles the broth of cooked clams. Produced primarily in the United States from the 1830s through the 1870s, this glass was made by adding tin oxide or bone ash to the batch, creating a translucent opalescent effect. Clambroth glass is most commonly found in barber bottles, candlesticks, and whiskey tumblers, and it occupies a specialized but devoted niche within the American pressed glass collecting community.

History and Production

• 1830s-1840s: Earliest clambroth pieces attributed to Sandwich Glass Company (Boston & Sandwich) and New England Glass Company
• 1850s-1870s: Peak production period; multiple factories in Pittsburgh, Wheeling, and New England produced clambroth items
• Color range: True clambroth is a warm grayish-white; some pieces show faint blue, green, or lavender tinting depending on batch chemistry
• The glass was blown-molded or pressed, and the slightly milky quality comes from light-scattering particles suspended in the glass matrix

Types and Forms

• Barber bottles: The most iconic clambroth form; often decorated with applied colored enamel stripes
• Candlesticks: Petal-socket and columnar forms are common; often found with clambroth paired with opaque colored bases
• Tumblers and whiskey glasses: Plain or with simple paneled patterns
• Lamps: Whale oil and fluid lamps in clambroth are scarce and desirable
• Salts: Open salt cellars in various pressed patterns
• Egg cups and spillholders: Occasionally found in clambroth; quite rare

Auction Price Ranges

Condition Factors

• Chips and flakes: Even small rim chips reduce value by 30-50% on pressed glass
• Color intensity: Strong, even clambroth color is preferred over thin or watery examples
• Mold quality: Sharp pattern definition indicates an early pressing from a fresh mold
• Enameling (on barber bottles): Original enamel decoration intact commands a premium; worn or missing enamel reduces value substantially
• Clarity: Slight translucency when held to light is characteristic; completely opaque white is milk glass, not clambroth

Collecting Tips

1. Distinguish clambroth from milk glass: Clambroth transmits some light with a warm grayish tone; milk glass is fully opaque white
2. Sandwich Glass Company pieces are most sought after; study Ruth Webb Lee's reference works for attribution
3. Barber bottles are the entry point for most collectors and remain affordable relative to rarer forms
4. Check for UV fluorescence: Some clambroth glass fluoresces under black light, which can help distinguish it from later reproductions
5. Pairs and sets bring disproportionate premiums over single pieces, especially for candlesticks
6. Handle carefully -- clambroth glass tends to be thinner than typical pressed glass and chips easily at rim edges