fotophox
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If I'm not mistaken, this would appear to be one of the patents for the original version of Kodachrome:
http://www.google.com/patents?vid=USPAT2039730
"It is an object of the present invention to provide a developer which produces a dye simultaneously and in situ with photographic development. It is a further object to produce novel dyes in color -forming photographic development. These and other objects are accomplished by the present invention by the use of aromatic amino developers together with certain specific coloring compounds hereinafter disclosed."
http://www.google.com/patents?vid=USPAT2039730
"It is an object of the present invention to provide a developer which produces a dye simultaneously and in situ with photographic development. It is a further object to produce novel dyes in color -forming photographic development. These and other objects are accomplished by the present invention by the use of aromatic amino developers together with certain specific coloring compounds hereinafter disclosed."