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. XLIX. Another Oriental Emerald Green finer than the rest.

TO make this fine Emerald colour; put into a Pot 4 pounds of common Fritt of Polverine, 5 pound of common white Glass Pulveriz'd, 5 pound of Crystal Fritt well washed; add to this Composition 3 pound of Minium or Red-Lead, mix them all together, and in a little time they will be pretty well purified. After that, cast all that metal into water to Purifie it more, taking care that no part of the Lead sink to the bottom of the Pot wherein it is cast, for it will break it, if Speedy care be not taken to take up again what is Precipitated. This Glass thus washed, and after dryed ought to be put in the Pot again, to be melted and Purified during the space of one day; then you must add a little of the Caput Mortuum of Vitriol of Venus without Corrosive, whereof we have spoken Chap. 45. with a little Crocus Martis: stirring the metal, and moreover proceeding as we have shewn in the Preceding Chapter. Then you will have an admirable Oriental Emerald Green, which may be wrought as you please. The Mi∣nium or Red-Lead, we speak of may be had at any Drugsters; yet you may make it with com∣mon mineral Lead, which is better in this Opera∣tion than that in Pigs, and cheaper. Pound it well, then calcine it at a good Fire, and it will be reduced to a Red Powder.