Info requested on French postcards

[Tom Ruffles]

I am looking for information on French postcards available on the streets of Paris between about 1904 and 1908 (though probably before and after those dates). Specimens were picked up by Charles Urban, a film entrepreneur, and were used, he says, as inspiration for an early colour film process. I am trying to find out more about these alleged cards - can anyone help me please? Here is what an account says of them:

These were ‘made in two transparent parts, one red and one green. Either viewed alone presented a simple and perhaps commonplace view of scenery. When super-imposed and held to the light together, they presented scenery that was neither simple nor commonplace.

I'd be grateful for information on these cards.

Thanks

[jofus65]

Have you had a look at the Charles Urban web-site? The history section, at: http://www.charlesurban.com/color.htm, details the development of his process. If it is accurate, the description would seem to exclude the possibility that Urban got inspiration from postcards.
However, at: http://www.charlesurban.com/prepared.htm there are reproductions of the 24 'Britain Prepared' warships postcards, which are done in a process that attempts to mimic the film process - perhaps the reverse of the process that you describe , but nevertheless the origin, perhaps, of your question? (ie, the pcs come from the film process, not the film process from the pcs). Stranger things have happened in the Chinese Whispers process of recalling events.
That is the only reference I can find to Urban and postcards. Apologies if I'm telling you what you already know.
jofus65

[Tom Ruffles]

Many thanks for this - the cards were alleged by Urban to be the inspiration for Kinemacolor but if they existed would have worked on a different principle. It looks to me like Urban trying to claim undue credit but I want to see if these sorts of cards ever existed, and how they might have caused Urban to make the conceptual leap to the Kinemacolor process. It looks like a later fabrication, and I doubt that cards as Urban describes them ever actually existed - but I would be happy to be proved wrong!