In most photographs the early 20th century appears grey. Grey as the Russia layed out in my 80s school atlas. However, in 1901/02 photographer Sergei Mikhailovich Prokudin-Gorskii (1863-1944) used a special technique to ‘capture three black and white images in fairly quick succession, using red, green and blue filters, allowing them to later be recombined and projected with filtered lanterns to show near true color images.‘
The results seem unreal!