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Sand from a Toulousain mine

Toulousain sand, which is harvested from the Côteau du Puy—David, deep down in the earth, is excellent on its own, but to make it sustain multiple castings, I mix it with pulverized and moistened sandever, which hardens it, holds well together with it, and enables as many castings as you like. Try to moisten the crushed glass and other sands with the essences of the aforementioned salts. Like all natural sand, it needs to be reheated well. Before putting it to use, one pulverises it, because it is in a lump, and then one reheats it in a copper boiler (or similar) until it ceases to smoke.

at left bottom margin of folio 084r

It is necessary to reheat it before using it. It becomes better for casting because it is reheated, but when it has been used too much, it must be refreshed with new sand.