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THE ARTIST'S MATERIALS.
Of chalk and paper (612--617).
6
12.
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.
6
13.
Chalk dissolves in wine and in vinegar or in aqua fortis and can be
recombined with gum.
6
14.
PAPER FOR DRAWING UPON IN BLACK BY THE AID OF YOUR SPITTLE.
Take powdered gall nuts and vitriol, powder them and spread them on
paper like a varnish, then write on it with a pen wetted with
spittle and it will turn as black as ink.
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