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while the red light causes the same body to cast a blue derived
shadow; but the primary shadow [on the dark side of the body itself]
is not of either of those hues, but a mixture of red and blue.
The derived shadows will be equal in depth if they are produced by
lights of equal strength and at an equal distance; this is proved.
[
Footnote 53: The text is unfinished in the original.]
[Footnote: In the original diagram Leonardo has written within the
circle q r corpo obroso (body in shadow); at the spot marked A,
luminoso azzurro (blue luminous body); at B, luminoso rosso (red
luminous body). At E we read ombra azzurra (blue tinted shadow)
and at D ombra rossa (red tinted shadow).]
On the nature of colours (277. 278).
2
77.
No white or black is transparent.
2
78.
OF PAINTING.
[
Footnote 2: See Footnote 3] Since white is not a colour but the
neutral recipient of every colour [Footnote 3: il bianco non e
06
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