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is placed in earthen Veſſels over ſharp Vinegar, and after it has acquired ſome Thickneſs of a kind of Ruſt, which it commonly does in about ten Days, they open the Veſſels, and ſcrape it off, as it were, in a kind of Foulneſs; they then place the Lead over the Vinegar again, repeating over and over the {{ls}ame Method of ſcraping it, till it is wholly diſſolved; what has been ſcraped off they then beat to Powder, and boil for a long Time; and what at laſt ſubſides to the Bottom of the Veſſel is the Ceruſe.
CII. In a Manner alſo, ſomething reſembling this, is Verdigriſe made; for Copper is placed over the Lees of Wine, and the Ruſt which it acquires by this means is taken off for Uſe: And it is by this means that the Ruſt which appears is produced[1].
- ↑ Our Manner of making Verdigriſe is as
Plates will be, in about ten Days or leſs, covered with a white Ruſt, which is to be ſcraped off, and the Plates plunged into the Vinegar again; and ſo ſcraped at Times till they are wholly eaten in Pieces: All the different Scrapings are afterwards ground to Powder together and kept for Uſe. Others make it, by putting Vinegar into an earthen Veſſel, then covering it cloſely with a Plate of Lead, and ſetting it in the Sun in hot Weather: this Plate will, in about ten Days, be diſſolved and precipitated in form of Ceruſe to the Bottom of the Veſſel.
