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which the writing is ornamented these passages must have been
written in Leonardo's youth.]
6
20.
You can make a fine ochre by the same method as you use to make
white.
6
21.
A FINE YELLOW.
Dissolve realgar with one part of orpiment, with aqua fortis.
WHITE.
Put the white into an earthen pot, and lay it no thicker than a
string, and let it stand in the sun undisturbed for 2 days; and in
the morning when the sun has dried off the night dews.
6
22.
To make reddish black for flesh tints take red rock crystals from
Rocca Nova or garnets and mix them a little; again armenian bole is
good in part.
448
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