“The Warner-Powrie process patented in 1905 was the earliest commercial process using a screen made with bichromated colloid. A glass plate was thinly coated with bichromated gelatin or fish glue and exposed to light through a screen having ...
Dufaycolor was a regular line screen process whereby the incident light was filtered through a pattern of tiny color patches created by lines in red, green and blue, the so called réseau.