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The high dispersion is beneficial in the use
of rutile as a white pigment because it increases the
selectivity of the optical scattering by the pigment and
this partially compensates for the absorption in the violet.

The strong absorption in this region had
been shown by reflection from rutile pigment but never
so strikingly as this demonstration of its failure to pass
through even the thin edge area of the prism. It is this
strong absorption in the violet that gives the pale
yellow color to a massive piece of rutile and the yel-
_ lowish undertone to rutile pigments.

A piece of Iceland spar, C, is inserted between the two
slits and oriented so that the two images of the horizontal
slit are located one above the other with the
light in one image polarized vertically and the light in
the other image polarized horizontally.
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