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Classic way of conveying images using black, white and shades of gray, thereby emphasizing shapes and shadows.

4 votes
2 answers
467 views

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 J …
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