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

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White bronzing on plaster

One must apply four layers of painters’ distemper glue onto the plaster portrait, leaving one layer to dry at a time. Then apply gently some burnt English point ground on a marble slab, or some lead burnt, ground and distempered with a bit of gum or glue. When dry, rub gently with a little cotton and the plaster portrait will look like lead. Others grind minium with quicksilver.