Royal Worcester Crucibles Or Pair Porcelain Cups 1920s Sillax Laboratory Ware

This is a very unusual pair of porcelain single cups that have been identified by a technical expert as chemical crucibles made in the 1910-1930s by Royal Worcester, England, then related to Steatite and Porcelain Company, Ltd.

"Laboratory Ware" or "Sillax" Heat and shock resistant. Developed in 1914 by request of the government to replace porcelain previously imported from Germany.

Sillax introduced in 1931 for schools / colleges: funnels, crucibles, beakers, etc.

Each of the cups measures 1.25 inches high by 1.75 inches in diameter.

I originally had them listed as eggcups, as that was the suggestion of the Worcester expert on the British Antique Ceramics website, but wouldn't recommend using them as such.

The mark was used only on scientific ceramics but they came with an English eggcup collection!

Very fun and unusual. In very good used vintage condition with no chips or cracks to the fine porcelain. The bottoms are unglazed. The glaze was affected when the name stamp was added during manufacturing. Neat!