612.

The Da Vinci Notebooks at sacred-texts.com

612.

p. 315

VI.

THE ARTIST'S MATERIALS.

Of chalk and paper (612--617).To make points [crayons] for colouring dry. Temper with a little wax and do not dry it; which wax you must dissolve with water: so that when the white lead is thus tempered, the water being distilled, may go off in vapour and the wax may remain; you will thus make good crayons; but you must know that the colours must be ground with a hot stone.