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. XCV. Another deeper Emerald-Colour.

THAT which makes Emerald deeper than the precedent, proceeds from the smaller quantity of Crystal employ'd in it, with more of the other Materials, which make it more fair, but also more brittle. You must Bake it at least six Hours longer than the precedent, to take away that Imperfection which Lead usually gives. The Dose of this Past, is one Ounce of Natural Crystal prepared, as we have shewn, six Ounces and an half of Red-Lead, seventy five Grains of Verdigrease, ten Grains of Crocus Martis made with Vinegar, the whole pulverized and well mixed together; then follow the Method we have shewn, in the preceding Chapter, which

would be too tedious to repeat here, and on every occasion, so we will avoid it; only observing to let your Matter stand longer in the Fire, as we have said, and you'll have an admirable Oriental Emerald∣colour, which being set in Gold with a Foil of the same Metal underneath, will be inexpressibly fair.