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

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Excellent type of molding with water

Dissolve some laxunge de verre in a moist place and then pour this water over what you wish to mold, having turned it in a circle. Then let it coagulate over hot ashes. Use the same process with vitriol and ferrous sulphate which are very calcinated and reduce in water.