Use black in the shadow, and in the lights white, yellow, green,
vermilion and lake. Medium shadows; take the shadow as above and mix
it with the flesh tints just alluded to, adding to it a little
yellow and a little green and occasionally some lake; for the
shadows take green and lake for the middle shades.

[Footnote 618 and 619: If we may judge from the flourishes with
which the writing is ornamented these passages must have been
written in Leonardo's youth.]