Following on from our previous piece on early colour photography, we thought we'd share another set of first-generation colour images.
These photos were taken by Sergey Mikhaylovich Prokudin-Gorsky, a Russian photography pioneer who so impressed Tsar Nicholas II that he was funded to trek across the Russian Empire and document its expanses with his new technology.
Prokudin-Gorsky continued working up until the Russian Revolution, after which he fled west. While many of his photographs were subsequently lost, a great deal have been made available by the Library of Congress here. It's a fascinating insight into how any of your ancestors from the region might have been living 100 years ago.
Here are a selection of our favourites. As always, click on any of these to enlarge the shot.