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This 12th-century manuscript has instructions on various arts and crafts. The section De imponendo auro has advice on illuminating manuscripts with loose gold leaf (BL, Harley MS 3915, fol. 12r-v) bl.uk/manuscripts/Vi… … #illuminatedmanuscripts #medievaltwitter #artsandcrafts 
It’s from Theophilus’s De diversis artibus, compiled c.1125. This is before gesso was being used, as it instructs to take the clear part of the beaten egg white, and paint it on to the manuscript where the gold is to be applied
The best bit is this:
et hora oportet te a vento cavere, et ab halitu continere, quia si flaveris, petulam perdes et difficile reperies -
et hora oportet te a vento cavere, et ab halitu continere, quia si flaveris, petulam perdes et difficile reperies -
