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

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To make bronze the color of azur

Take rock alum and antimony, with twice as much rock alum as antimony, and pound it together in an iron mortar and soak with gum water, then grind it on a marble, and then it needs to be used with a paintbrush, and after letting it dry, polished with wolf tooth or dog tooth.