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

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Hard wax to imprint seals

One makes these [seals] out of white wax which is harder than the other and one mixes in it some cerussite or leaded white very finely ground such that it is as hard as you like and mix in a drop of turpentine to bind it. Afterwards mix it in the color that you want. It is in wax that serves goldsmiths for modeling.