Russia in color, a century ago

I just came across these amazing photos from Russia, they were taken in 1910, one hundred years ago! They are not hand colored black and white prints they are actual color prints derived using a three plate camera that exposed three images through red, green and blue filters, from these negatives realistic color slides could be made, the slides were projected. It’s exactly the same process that Technicolor motion picture film used in Hollywood in the 1930’s except that a technicolor camera was a huge beast that ran three 1000ft rolls of B&W film simultaneously and had three lenses each with a color filter. The films that you saw were not produced photographically, they were printed on film in the same manner as color magazine photographs.
The prints are at: