Side Note: Tricolor Printing Filters

wavelengths of RGB that most color photographic papers respond to best are the wavelengths that are passed by Kodak Wratten filters: No. 25 (red, 610nm); No. 99 (green, 545nm); and No. 98 (blue, 430nm). Those three filters are referred to as the tricolor printing filters, and were used to do tricolor printing in the darkroom.

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