Assertion: felspar porcelain | /r/HasProperty | introduced on the market
Facets:
value: in 1821
type: TEMPORAL
Source sentences:
text: In Spode's similar "Felspar porcelain", introduced on the market in 1821, felspar was an ingredient, substituted for the Cornish stone in his standard bone china body, giving rise to his slightly misleading name "Felspar porcelain," to what is in fact an extremely refined stoneware comparable to the rival "Mason's ironstone", produced by Josiah II's nephew, Charles James Mason, and patented in 1813 Spode's "Felspar porcelain" continued into the Copeland & Garrett phase of the company (1833–1847).