@dbellingradt@histodons
Even some early movie films were hand coloured. All those tiny frames!
Though there was RGB colour film at the end of the Victorian age an exposure was 20 minutes. It wasn't till there was CYM layered film that colour movies were possible.
I think before 1742 China was doing coloured prints using multiple wood blocks.
Nitric acid was 14th C, or maybe 10th C. But using it for silver nitrate photos was 19th C.