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

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Make copper and latten flow

At the end of the casting, as it is very hot, add some salt ammicke and saltpetre, it is a way to remove grime. Mix some clay with the latten. The metal must not touch the iron or the latten of the frame, but covered with sand or luth, it makes a very homogeneous cast.