Ambrotype

An ambrotype is a collodion negative on a clear glass plate with a backing of dark paper, velvet, or varnish. This dark backing reverses the negative's tones and makes it appear positive. Each is unique and cannot be reproduced. Ambrotypes were generally matted and presented in decorative cases.

Ambrotypes, like daguerreotypes are "direct positives," or negative images that appear to be positive. Though less detailed than daguerreotypes, ambrotypes were simpler and less expensive to produce. Their popularity peaked between 1851 and 1865.

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