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

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Wheat oil

Is made on a blade of iron reddened in the fire, and the oil turns into drops, which is appropriate to oil the hair of a butterfly or similar thing, because this oil is instantly dry and makes the rest dry out. It is necessary that the coat or down of any animal that you want to mold be flat, because if left standing up, it will make the sand raise up and form bubbles.

at left middle margin of folio 110v

# If you want to mold something delicate, like a pansy, some, to give it a little thickness, more than what is natural, some rub it with butter. But it is best to oil it with wheat oil because it has no opacity and does not block the smaller features as much, and makes the flower firmer.