The Sincerely Discovered Art of Assaying and Refining of the Venetians

continues from previous page from that make a powder, and take 3 parts of the powder and 1 part of the metal, and do as before.

11.

A flux, which makes all ore malleable,

and constant for every fire, in order

to melt with it whatever one will.

Take goat-milk or cow-milk, as much as you will, and take a salt, called Alkus barax, and pounded salt, saltpeter, rock salt original: "Sal Gemmæ", of all equal parts, and as much sulfur as all the previous pieces together, and mix them together, and put it into a glazed crock, pour goat-milk onto it, let it stand fourteen days, stir it every day, afterward let it run through a felt, and drip out well: Do with it as stands written before.

12.

A parting-powder.

Take a newt, kill and burn it in the field, so that the wind does not blow upon you when you open the pot; watch yourself that the fumes and smoke do not go into you. When the pot is cold, break it open: one separates the white specks from the worm; with that one separates silver from the ore, but with the black powder one separates gold from copper, namely, when it is melted, one throws the powder onto it.

13. Item.