How to make manuscript gesso

Several people have contacted me over the past week asking me where I buy my manuscript gesso from. The answer is that it is not, as far as I am aware, commercially available here in the UK, so I make my own. Here’s the recipe:   8 parts of slaked plaster of Paris (calcium sulphate dihydrate) 3 parts of powdered lead carbonate –  BEWARE, POISONOUS 1 part seccotine glue 1 part sugar, ground to a powder A pinch of Armenian bole...

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