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ABOUT SHAFTISM ... Page 3
Isaac Newton (1643-1727), following Francis Bacon (1561-1626) and observations from the French philosopher
René Descartes (1596-1650), proved, by his famous experiments with prisms, that sunlight was composed of
rays of a great number of different colours, and the simple reason why bodies exhibit so many different
colours is that each absorbs in its own particular way certain of these component colours to a greater extent
than others. White light robbed of green will appear red, and if robbed of red will appear green. A white
body throws back to the eye rays whose combined effect still produces the sensation of white. If such a body
is viewed in red light it will throw back red light, and would appear to be red if we had a really white
body in its vicinity with which to compare it. A red body, on the contrary, throws back light in which the
red rays predominate. In red light such a body will appear red, but in pure blue light it will appear black
or nearly so. Very few natural objects give pure colours, a fact, which must not be lost sight of, in
explaining colour effects. For example it is a familiar fact that a mixture of yellow and blue pigments,
produces green. This could not be though, if the pigments were pure colours to begin with, for in such a case
the blue particles would absorb all but the blue, and the yellow particles, all but the yellow, and a ray of
light passing through both would be robbed of all its rays. Its an interesting point though not important as
nothing is pure, or rarely so, both sets of particles allow a good deal of green to pass as well as the
colour, corresponding to their respective tints, so that the light which has passed through both is mainly
green.
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