Making and Knowing
A minimal edition of BnF Ms Fr 640 in English Translation

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To make gold fluid

Put as much verdigris as sal ammoniac, as much borax as saltpetre. But don’t add a greater quantity of borax and saltpetre than half the quantity of verdegris and sal ammoniac, in fact add as much borax and saltpetre all together as verdigris. Grind into powder the ingredients on the marble slab, then grind again with very good vinegar until it is very fine, like a ground color, grind verdigris with oil, then leave to dry if you have time, if you haven’t so much time dry it with the fire of the forge, make so that it is very dry.

at left top margin of folio 134v


at left top margin of folio 134v

One of the principal things for casting is to cast very hot, especially large metals