A Treatise on Painting, by Leonardo da Vinci
1721
Senex and Taylor, London
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The Reflex's of a*Carnation, receiving their Light from some other Carnation, will be of a redder more vivid and more Vermilion Colour than any other Part of the Body: The Reason is, because the Surface of any Opake Body partakes more of the Colour of the Body from whence it has its light, as that Body is nearer it, and less as it is further removed: It likewise participates more or less of it, as the Opake Body is greater or smaller; because being large, it intercepts the Species of the adjacent Bodies, and prevents them from mingling their Colours with its own; which, were it small, wou'd infallibly be the case. Sometimes, however, it happens that a Reflex partakes more of the Colour of a small Body, that is near it, than of a larger more remote; the effects of the latter being render'd less sensible, by reason of its distance.
* By Carnation is sometimes meant barely a Colour; at other times it signifies a naked Part of a Figure, uncovered with the Drapery.