< A Treatise on Painting
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Chap. CCXL.—No Object appears in its true Colour, unless the Light which strikes upon it be of the same Colour.

This is very observable in draperies, where the light folds casting a reflexion, and throwing a light on other folds opposite to them, make them appear in their natural colour. The same effect is produced by gold leaves casting their light reciprocally on each other. The effect is quite contrary if the light be received from an object of a different colour[1].

  1. ↑ See chap. ccxxxvii.

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