Jewish children with teacher, 1911
The Library of Congress is exhibiting the photography of Sergei Mikhailovich Prokudin-Gorskii (1863-1944). These remarkable images were made as magic lanterns slides, and were displayed in color using a set of red, green, blue filters. The LOC has been able to produce new digital colored images by a process they are calling digichromatography, and their results are very impressive.
Hat tip to Chuck.