Dating ambrotype photos

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Introduction : In this article, Mary Harrell-Sesniak shows how you can date old, undated family photos by first figuring out what type of photograph they are, and uses old newspapers and other sources to illustrate different types of photos. Mary is a genealogist, author and editor with a strong technology background. Do you have a box of old, undated family photos somewhere up in the attic—or maybe buried in the back of some closet? Have you wondered how you were ever going to figure out who these family members might be, since the old photographs lack inscriptions or dates? Genealogy is a lot like detective work, gathering clues to make the pieces of your family puzzle fit together.
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How to Date Old Ancestor Photographs with Early Photo Types

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How to spot a collodion positive photograph, also known as an ambrotype

Last week I began a series of posts showing you how to date your old family photographs using format and process , by looking at daguerreotypes , the very first commercial photographic process. The collodion positive, or ambrotype, first appeared in about By the s the process had largely disappeared from high street studios, but it remained popular with itinerant open-air photographers until the s, because portraits could be made in a few minutes while sitters waited. The collodion positive process, which was based on the collodion negative process invented by Frederick Scott Archer , reversed a negative image by bleaching the silver salts. The dark areas which would normally form the highlights in a printed image turned pale, and the clear areas which would form the shadows in the print appeared to be dark. When presented against a black background, the dark areas of the original negative, which had been bleached with nitric acid or bichloride of mercury, appeared as highlights.
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How to spot a collodion positive, also known as an ambrotype (early 1850s–1880s)

Like a print on paper, it is viewed by reflected light. 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. The ambrotype was introduced in the s. During the s it was superseded by the tintype , a similar photograph on thin black-lacquered iron, hard to distinguish from an ambrotype if under glass.
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Two young men stare out at me from a small old photograph. On the back, in my grandmother's handwriting, is written "Grandpa King's brothers. At least I've got some information to work with, but I'm eager to learn more: When was the picture taken? Which two of my great-grandfather's brothers are these? Michael and Peter?
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