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Among the glass plate negatives there are only a few that feature people. The information on the protective sleeve for this photo was captioned "Angelia". She appears to be holding lilac flowers.
A little history about glass plate negatives:
Two types of glass plate negatives exist: the collodion wet plate invented by Frederick Scoff Archer, in use from the 1850s, and the silver gelatin dry plate created by Dr. Richard L. Maddox, in use from the 1870s. The wet plates were hand coated by photographers. The dry plates were easier to transport (though still heavy) and didn’t require as much exposure to light. Both processes are still in use by fine art photographers, for their great tonal range and detail, but back in the day they were commonplace for news photography.
Starting in the 1850s, collodion, a flammable liquid, was spread on a glass support, or plate, then placed into a bath of silver nitrate which turned the collodion into a photosensitive silver iodide. This process, including exposure and processing, had to happen immediately before the plate dried.
While the wet collodion process had a five-minute exposure time before the plate dried, the dry-plate negative allowed photographers to prepare their negatives in advance and develop images long after exposure.
More historic photos available on the New Ipswich Historical Society website
Also on their Facebook page