Here's another page with WWI colour photos, plus more. Many are the same pics but there are plenty of others. You can also read a discussion about the technique, which I was unable to see at the above link. (There's always somebody who refuses to admit that something is real, despite all evidence to the contrary, isn't there?
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http://www.greatwar.nl/frames/default-color.htmlIn a related post, for those who missed it, colour photographs of Czarist Russia can be found here.
http://leadadventureforum.com/index.php?topic=1746.0