During the development of analog proofing processes
(e.g., Cromalin and Matchprint, see also sec. 3.1.6), colorants
for powder toner or overlay color film materials
with primary-color locations that correspond to those
of the standardized process inks under a given type of
standardized illumination were sought. In addition,
these colorants should also have the same reproduction
characteristics (dot gain, etc.) as a conventional ink. In
the absence of suitable colorants (e.g., pigments), in the
end only substitute colorants which were as similar as
possible were found. Therefore, strictly speaking these
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