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

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Clamps and the broken mold

When you have done the first firing and taken off the clamps and you have opened your mold to clean it by taking off the bubbles with quicksilver which one cannot do with closed molds, reclose the mold and reattach the clamps but not in the same place as the first time. Reapply lute and dry it but if this is for casting silver or gold [use] lute with the rest of sand which has been used because this is the best netting. If your mold is broken in refiring you can augment it with clamps and lute.

at left bottom margin of folio 133r