Prior to WWI in Imperial Russia, a photographer named Sergei Mikhailovich Prokudin-Gorskii developed a process to take color images. He built a camera that could expose three black and white images simultaneously onto glass plates.
Each image was exposed through a different filter, yellow, magenta and cyan.
The resultant developed images could then be projected as slides through the same color filters and registered together on a screen to produce a color image. With modern computer technology these old images can be colorized and joined together to produce color images of century old scenes.
