< A Treatise on Painting
Chap. CCLXIX.—The apparent Variation of Colours, occasioned by the Contraste of the Ground upon which they are placed.
No colour appears uniform and equal in all its parts unless it terminate on a ground of the same colour. This is very apparent when a black terminates on a white ground, where the contraste of colour gives more strength and richness to the extremities than to the middle.
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