Dating wedgewood pottery
Wedgwood had introduced a different type of stoneware called black basalt a decade earlier.
Jasperware's composition varies but proportions may be given as follows: sulphate of barytes 150, china clay 35, blue clay 45, flint 35, gypsum 6, and Cornish stone 50.
These vases were first known in England from D'Hancarville's engravings, published from 1766.Inspiration for Flaxman and Wedgwood came not only from ancient ceramics, but also from cameo glass, particularly the Portland Vase which was brought to England by Sir William Hamilton.The vase was lent to Wedgwood by the third Duke of Portland.Wedgwood devoted four years of painstaking trials at duplicating the vase - not in glass but in black and white jasperware.Jean-Baptiste Stahl developed his own style and techniques during his work at Villeroy & Boch in Mettlach, Saar, Germany.
The name Phanolith was coined for this kind of jasperware.