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CHAP. LXXXIV. To make Glass of Lead of a fair Emerald Colour.
THE easiness of tinging Glass of Lead of any colour, is the reason, you may be sure, of gi∣ving it an excellent Emerald-Green, especially be∣cause Green is also Natural to it.
Take twenty Pound of Crystal Fritt powder'd and searced, and sixteen Pound of Galx of Lead also sift∣ed; mix them well together, then put them little by little into a Pot heated in a Furnace, and eight or ten Hours afterwards it will be melted; then cast the melted Matter into Water, and carefully take the re∣maining Lead from it; then put the Matter after it is dried into the same Pot again, and seven or eight Hours after it will be again melted. Reiterate this process of casting the melted Matter into the Water, and separating the Lead that sticks to the Pot, as be∣fore; then this Glass will be cleansed and purified from all the foulness and unctuosity the Calx and Pow∣der would leave in it and be very resplendent. You must put it again in the Pot, where it will melt and purifie in a little time. When it is melted, put to it six Ounces of Scales of Copper thrice calcin'd in Powder, as in Chap. 34, with twenty four Grains of Crocus Martis, made with Vinegar, as in Chap. 25, al∣so in Powder, and mix them together.
This Powder must be cast in at six times, always mixing well the Glass, and taking at each time the interval of saying the Creed: Let it rest one Hour, and then stir it again, and see if the Colour pleases you: If it be as you would have it, let it stand eight Hours, that the whole may well incorporate. Then