Utocolor was a color photography

Color photography

Color photography is photography that uses media capable of representing colors, which are traditionally produced chemically during the photographic processing phase...

 system, particularly designed for motion picture color, invented by Dr. J.H. Smith in 1895. It was a three-color subtractive transfer process using the bleach-out/dye destruction method for making a color print by printing from a color transparency. It depends upon the bleaching property of certain wavelengths for certain dyes.