Color Separation Filters
E. J. Wall wrote filter making instructions in his 1922 book, Practical Color Photography. The book is not difficult to locate but you can also download it for free at this link: https://archive.org/details/practicalcolorph00walliala
Chapter 2 describes how to make separation filters. Chapter 11 gives complete directions for making a photochromoscope, and the viewing filters. Wall describes the issues surrounding the selection of appropriate taking and viewing color dyes.
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