The art of glass shewing how to make all sorts of glass, crystal and enamel : likewise the making of pearls, precious stones, china and looking-glasses : to which is added, the method of painting on glass and enameling : also how to extract the colours from minerals, metals, herbs and flowers ... : illustrated with proper sculptures / written originally in French, by Mr. H. Blancourt, and now first translated into English ; with an appendix, containing exact instructions for making glass-eyes of all colours.

CHAP. CI. To make a Paste for an Oriental Chrysolite.

WE have told you that the Modern Jewellers call that a Chrysolite which the Ancients cal∣led a Topaz, or Chrysopas, which is a Precious Stone, Green and Diaphanous, some whereof cast a Lustre of Gold: This Stone is so hard, that it will easily endure the File, and sometimes there are pieces of them found big enough to make Statues of; witness that related by Iuba King of Mauritania, which was made in Honour of the Queen Arsinoe, Wife of Pto∣lomaeus Philadelphus, of the height of four Cubits.

To imitate this Stone, take two Ounces of Natu∣ral Crystal prepar'd, eight Ounces of Minium in small Powder, add to it 12 Grains of Crocus Martis made with Vinegar, as in Chap. 25. mixing the whole well together. Then put the whole into a Crucible in the same Furnace as before, leaving it there a little lon∣ger than the others, that it may have time to purifie from the Lead. Then you'll have a Paste for the Ori∣ental Chrysolite, which will appear very admirable set with a Foil in Gold.