IIRC this is similar to the first cameras, which used bright light to change the color of the film or whatever material they used. This can also be seen on cardboard in the sun. Things set on top of the cardboard leave shadows where they used to be...
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thank you we can make propper printer and camera now
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I tried similar things too, but never got to making a proper save from it. You were faster than me, plus I never had the idea of using coal, so +1 for you!
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After long time we can to make don't only black-white photos
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That's an intresting idea. 1+
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interesting concept. =D +1
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clever