From as early as the photographers were adding colour to their prints, painting with dyes. They then started to experiment in the darkroom, adding coloured pigments to their positive prints. Adding colour to landscapes ‘ Odawara’ Felice Beato, 1864
Notice the blur of the Chicken crossing the road -- 1 tanuki points out, it looks like the white chicken left his shadow behind in the middle of the road ! And NO, I don't know why the Chicken crossed the road.