Abstract
ABSTRACTAlthough it is emphasized that the proper practical approach to minimizing metamerism in industrial coloring processes is through spectrophotometry, rules are developed for selecting and, if necessary, blending colorants to control metamerism through a purely visual approach. Examples are taken from the vinyl plastics industry, and it is assumed that the match is to be made with a black, a white, and two chromatic pigments. With the approximate hues of all available chromatic pigments marked on a simple hue circle, a trial match to the standard is made. Rules are developed and illustrated for altering the selection of chromatic pigments to reduce metamerism, based on the change in color of the trial match relative to that of the standard as the light source is changed from daylight to tungsten or fluorescent light. With practice, compositions which are good visual matches to the standard in all three sources can be obtained.
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