Start Dating old american photographs

Dating old american photographs

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In the mid-1850s, ambrotypes replaced the daguerreotype.

An ambrotype is a negative that has been put on glass and placed against a black background to make it look like a positive. Another example of a cased image like the daguerreotype or ambrotype is the tintype, which was patented in 1856 and was made using a thin sheet of iron.

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