Ambrotype

The ambrotype, also known as a collodion positive in the United Kingdom, is a positive photograph on glass made by a variant of the wet plate collodion process. As a cheaper alternative to the French daguerreotype, ambrotypes came to replace them. Like a print on paper, it is viewed by reflected light.

Like the daguerreotype or the prints produced by a Polaroid camera, each is a unique original that could only be duplicated by using a camera to copy it.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

PLATEANDFILM

The old ways of the image — ambrotype, tintype, and film-photography heritage.

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