Gartside, Mary
An Essay on Light and Shade, on Colours, and on Composition in General — London, 1805

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COLOURS,

THEIR ARRANGEMENT IN GROUPS.

J.T is not intended in the following pages to explain the nature or cause
of colours, or to speak of the theory any further than as it relates to the
effect of colours in painting. To that end it is necessary to observe, that
the rays of the sun convey colour as well as light and heat; that there are
said to be seven original or primary colours, which are all visible in the
rainbow, or through a prism;, red, orange, yellow, green, blue, indigo,
violet. Notwithstanding this, some are of opinion, that there are in reality
only three original colours, red, yellow, and blue ; others think it probable
that there are four, including indigo, differing in opinion from philosophical
experiments on the rays of light. Be this as it may, it is certain, that by
compounding the first three colours the other four are produced, at least
they are very nearly imitated : for instance, if you mix red and yellow, they
produce, orange; if yellow and blue, you get a green ; with red and blue,
a violet; and .with blue and violet, indigo; thus are four of the colours
produced by the other three. -«>

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