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Image on Glass Dating ambrotype photographs is fairly easy for genealogists.
It is a cased image like the daguerreotype, but it was short-lived.
Even the softest camera lens brush will scratch the delicate surface.
At best use compressed air to remove loose dust or particles.
It doesn't matter if you're a serial swiper or seeing one person regularly, all the think pieces and second-hand (or first-hand!
SPECIAL NOTE: Do not try to clean the face (or image side) of an ambrotype.
From 1859 onward, the preserver exhibited elaborate designs, with bulges at the corners and in the middle of the edges.
There are three different glass examples in the ambrotype.
This and other characteristics will help you in dating ambrotypes.
Mats, the brass inner frame that laid on top of the glass, experienced design evolutions that are datable.