Salt Glaze: Vapor-Glazed Stoneware
Salt glaze is a ceramic glazing technique in which common salt (sodium chloride) is thrown into a kiln at peak temperature (around 2,300 degrees F), where it vaporizes and reacts with the silica in the clay body to form a thin, glassy coating with a distinctive orange-peel texture. Used from the 14th century in Germany through the 19th century in England and America, salt-glazed stoneware represents one of the most important ceramic traditions in Western decorative arts.
History and Origins
- 14th-15th century: Technique developed in the Rhineland, Germany (Cologne, Frechen, Raeren, Westerwald)
- 1670s: Introduced to England by John Dwight at Fulham
- 1720s-1760s: Staffordshire white salt-glazed stoneware at its peak — refined, thin-bodied ware rivaling porcelain
- 18th-19th century: American production centered in New York, New Jersey, Pennsylvania, and later the Midwest
- 1860s onward: Gradually replaced by Bristol glaze (alkaline slip) in commercial production due to environmental concerns from salt fumes
Identification
- Surface texture: Characteristic orange-peel or dimpled surface from the salt vapor reaction
- Body: Dense, vitrified stoneware; typically gray, brown, or buff colored
- Staffordshire white salt glaze: Refined white clay body with crisp molded decoration, often mistaken for porcelain
- German examples: Typically gray body with cobalt blue or manganese purple decoration
- American examples: Usually gray or tan body with cobalt blue brushed or stenciled decoration
Types and Price Ranges
| Type | Description | Typical Price Range |
|---|---|---|
| Staffordshire white salt glaze plate | Molded basket-weave or barley pattern | $100 - $500 |
| Staffordshire scratch-blue | Incised decoration filled with cobalt | $300 - $1,500 |
| German Westerwald jug | Gray with cobalt blue, 18th century | $200 - $800 |
| German Bellarmine jug | Bearded face mask, 16th-17th century | $300 - $2,000+ |
| American crock, standard | Cobalt-decorated, 2-6 gallon | $100 - $500 |
| American crock, elaborate | Bird, deer, or figure decoration | $500 - $10,000+ |
| American jug | Cobalt flower or name decoration | $150 - $800 |
| Staffordshire figure or pew group | White salt glaze, mid-18th century | $1,000 - $15,000+ |
| Nottingham salt glaze | Brown, lustrous surface, 18th century | $200 - $800 |
Condition Factors
- Chips: Salt-glazed edges are vulnerable to chipping; rim chips are common and reduce value
- Cracks: Hairline cracks that occurred in firing are less damaging than usage cracks
- Cobalt decoration: On American pieces, strong, bold cobalt decoration is the primary value driver
- Staining: Interior staining on utilitarian pieces is expected and accepted
- Restoration: Repairs to American stoneware are common — inspect under UV light
Collecting Tips
- American salt-glazed stoneware with elaborate cobalt decoration (birds, animals, people, patriotic motifs) is the most competitive collecting area and can reach five figures
- Staffordshire white salt glaze from the 1740s-1760s is among the finest English ceramic production and remains undervalued relative to contemporary porcelain
- German Bellarmines (also called Bartmann jugs) are iconic early stoneware and have been collected since the 19th century
- Learn to distinguish salt glaze from Bristol glaze (Albany slip) — salt glaze has the distinctive pitted surface; Bristol glaze is smooth
- Maker-marked American pieces (Crolius, Remmey, Edmands, Norton) bring significant premiums
- Condition tolerance varies by category — utilitarian American pieces with minor chips are accepted; Staffordshire tableware is held to higher standards