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

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Talcum mixed with the molds

I used the one from which I had extracted the oil. I crushed it very finely even more into a steel mortar with a pestle [which was] rough like a file. I crushed it very finely into a cottony, downy powder. I mixed it with the sand and soaked both matters together, and I casted it en noyau. It molded very clean and there is no doubt that it will withstand fire.