glasses

Glasses                                             
by Meysam                

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The chemical process by which the latent image on exposed film is turned into a visible image.

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What process was used to make this glass plate?

I have an old glass positive photo from about 1850. Does anyone know what process was used? Heliotipy? Puharotipy? I'm think that the author of the image is Puhar I have an appointment with the ...