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For a number of years the Optical Society of America has run parallel sessions one of which is devoted to papers on spectroscopy and the other to papers on color. The ardent spectroscopist has thus been carefully isolated from color problems since instantaneous transitions between the quantum levels of the Keystone and Georgian rooms have a low probability if they are not altogether excluded by some corollary of the Pauli principle. The few spectroscopists who have by some mischance gotten into the wrong session have probably left quickly since the technical language used by the color people is as forboding to applied spectroscopists as the terminology of spectroscopists is to their uninitiated brethern. Color is nevertheless a branch of applied spectroscopy even if it does not deal with the analysis of materials but rather with the appearance of materials.
Deane B. Judd (Wed,) studied this question.