Volume Volume1\Theory of Colours
Entry# 279. On gradations in the depth of colours (279. 280).
Contents: Vol. 1 | Vol. 2
Since black, when painted next to white, looks no blacker than when
next to black; and white when next to black looks no whiter than
white, as is seen by the images transmitted through a small hole or
by the edges of any opaque screen ...
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