Dating an ambrotype


15-Feb-2016 08:53

In 1854, an American named James Cutting filed three patents for new ambrotype processes—in a curious footnote, Cutting changed his middle name from Anson to Ambrose, perhaps to more closely associate himself with ambrotypes in the same way that Louis-Jacques-Mandé Daguerre was linked by his name to daguerreotypes.

Like daguerreotypes and some of the tintypes that came a bit later, ambrotypes were also cased to protect them.

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They are stamped "Neff's Melainotype Pat 19 Feb 56" along one edge.Like the daguerreotype, which it replaced, and like the prints produced by a Polaroid camera, each is a unique original that could only be duplicated by using a camera to copy it. During the 1860s it was superseded by the tintype, a similar photograph on thin black-lacquered iron, hard to distinguish from an ambrotype if under glass.One side of a clean glass plate was coated with a thin layer of iodized collodion, then dipped in a silver nitrate solution.There was the ambrotype (with or without a black background, which was required to keep the image from resembling a negative), topped by a layer of brass matting to frame the image and protect it from another layer of glass on top of that.

Holding these pieces together was the preserver, also made of brass, all of which was then secured in the case, which was lined with velvet or silk.

In either case, another plate of glass was put over the fragile emulsion side to protect it, and the whole was mounted in a metal frame and kept in a protective case.



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