Hand-colored, "photochromes". One of them is in Commons category "1900 black and white photographs". Check out "autochromes", though:

https://commons.wikimedia.org/wiki/Category:Autochromes

Leonid Andreev's moody selfie poses amuse me. (Circa 1910.)

https://commons.wikimedia.org/wiki/Category:Autochromes_by_L...