This section is from the book "Arts & Crafts Magazine Vol1-2", by Hutchinson & Company.
The processes used for obtaining the metallic reflections so much admired in line specimens of Hispano-Moresque and Gubbio wares have long been regarded as among lost arts, though many attempts have been made in modern times to imitate the golden reflections of Valentia and Granada platters and vases, and the ruby red of the Italian faiences. Deck, the great French potter, gives the following recipe as the result of his experiments: - For the gold, take sulphate of copper, two parts; sulphate' of silver, one part; mixed red and yellow ochre, twelve-parts, and sulphate of iron, live parts; or, another combination is, sulphate of copper, live parts; nitrate of silver, two parts; colcothar, one part', and bol d'Armenie, four parts. For the ruby, take sulphate of copper, live parts; protoxide of tin, two parts; lamp-black, one part, and mixed red and yellow ochre, four parts. The ruby may be varied by using, instead of the above.'oxide of copper, eight parts; oxide of iron, five parts; colcothar, six parts, and bol d'Armenie, six parts These matters are pulverised and mixed with wine Vinegar, and applied rather thickly to a piece-already tired and glazed. The piece is then exposed in a small furnace to flames barely at red heat. Smoke aids the operation.