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

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Clay used to surround molds, should be very fat and malleable, and should not be used for anything else except to make the contour of the molds. Therefore one should only choose that which is very fat and beat it very well and soak it moderately with water and have it in a pit or earthenware pot and make good holes with a stick with which one replenishes it with water to keep it always fresh and soft and ready to use when needed.