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

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White varnish on plaster

Put down two or three layers of white glue for painting. Afterwards, varnish with varnish of sandarac, aspic oil, and a bit of mastic. Put it into a vessel at night, everything ground well together without fire, which would make it turn yellow. Then, with a paintbrush, it becomes dry immediately. Filter the oil that will have absorbed the substance.