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is a unique original that could only be duplicated by using a camera to copy it.

The ambrotype was introduced in the 1850s. During the 1860s it was superseded by the tintype, a similar photograph on thin black-lacquered iron, hard to distinguish from an ambrotype if under glass.

The term ambrotype comes from ambrotos, "immortal", and ????? typos, "impression".

Process

One side of a clean glass plate was coated with a thin layer of iodized collodion,

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