Fleta minor the laws of art and nature, in knowing, judging, assaying, fining, refining and inlarging the bodies of confin'd metals : in two parts : the first contains assays of Lazarus Erckern, chief prover, or assay-master general of the empire of Germany, in V. books, orinally written by him in the Teutonick language and now translated into English ; the second contains essays on metallick words, as a dictionary to many pleasing discourses, by Sir John Pettus ... ; illustrated with 44 sculptures.

CHAP. XXXIII. How to boyl Copper from the pagment or old Silver in Coined Money, or from thin beaten plates of Silver.

TAKE sulphur and vitriol of both alike in quantity, grind them small, and make them a little wet with Vinegar that it become as a Pap, mingle the Coyn or old Silver among it, then take a long Lin∣nen sack, put the Money with these ad∣ditions in it, sow the Sack on the sides from the top to the bottom, so that the Mony may not lye too thick in it, pour Water into a pot, and hang the Sack in it, that it may neither touch below, nor on the sides; boyl it well ten or twelve hours with the fire, and so much as the Water does wast by boyling, you must add to it again with warm Water, so that the Pot may be always full of Water, whereby the Copper will be boyled out of the Silver or Coyn, and the Silver will remain in the Sack, then wash it with warm Water and pour it together, but the Water will boyl and dry in, and the rest melt together (with the Flus vvhich is used to Copper Oar)

thus you have the Copper which hath been boyled out of the Money, only the silver by this is not altogether fine but retaineth some small quantity of Copper in it.