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. XC. The Way to make a Golden-colour in Glass of Lead.

THIS Colour is as fine in Glass of Lead, as in Crystal: It takes that Colour both from the Lead, and the Ingredients mixed with it.

Take sixteen Pound of good Crystal Fritt in Pow∣der, to which add the same weight of Calx of Lead also in Powder, and well searced; then add six Ounces of Copper Scales thrice calcin'd, as in Chap. 34, and forty eight Grains of Crocus Martis, made with Vinegar, as in Chap. 25, the whole mix∣ed well together, put it in a Pot heated in the Furnace: Twelve Hours after cast the Glass in Water, and take the remaining Lead out of the Pot, and then put the Matter again into the same Pot, to be well purified during Twelve other Hours.

After that, stir it well, and see if the Colour pleases you; if it chance to be greenish, add to it some Crocus Martis, and the Greenness will vanish; then you will have a Golden-colour very fine, which may be Wrought.

These are all the Colours we can give to Glass of Lead alone. We shall augment the Number in a Past of Lead, whereof we shall shew the Prepa∣ration in the following Book, because it is useful for imitating Precious Stones, as we shall shew in the same Book; which is the Reason we have not done it in this.

The End of the Fourth BOOK.