Ambrotypes: Collodion Positives--Process

ambrotype plate
Figure 1.--Here we see a typical Ambrotype class plate. Click on the image to see the actual portrait.

A variation of the "wet collodin" was the ambrotype. The ambrotype is an underexposed wet-collodin negative on glass. The glass could be different sizes, but most were done on small class plted which were carried in cases like Daguerreotypes. Photographers cleaned a glass plate and carefully poured iodized collodin on it. The next step was immerse in a silver-nitrate bath. Finally it was put into the camera while still wet. After exposure, it had to be performed before it dried. Ambrotypes were, like Daguerreotype direct positives, made by under-exposing collodion on glass negative, and bleaching it.


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Created: 4:07 AM 5/4/2010
Last updated: 4:07 AM 5/4/2010