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Ambrotypes were a direct positive process effect achieved on glass coated with light-sensitive collodion backed with black paint paper or even black velvet It is also known as a collodion positive They are often confused with Daguerreotypes because they were often housed in dag cases and confused with Tintypes because the images look very similar The process was invented by Frederick Scott Archer and Peter Fry in 1851 but was patented in the US Boston MA by James Ambrose Cutting in 1854 James Cutting was born in Worcester Massachusetts in 1814 His family moved to Vermont and took up farming and there Cutting devised and patented a new kind of bee hive bringing him profit and renown He was not a very adept investor however and he soon went broke and came to Boston where he tried his hand at making daguerreotypes He is credited with the discovery of a process for making pictures on glass called ambrotypes after his middle name His method of photos involved a glass sheet for photos that was covered with collodion for photos and that was underexposed or bleached Ambrotypes are sharply detailed one-of-a-kind photographs on glass packaged in protective cases similar to those used for daguerreotypes An ambrotype is basically a collodion on glass negative that is intentionally underexposed so that the negative appears as a positive image when viewed against a dark background Ambrotypes soon replaced the more expensive daguerreotypes as the favored process for portrait photography The process has the additional benefits of being non-reflective making ambrotypes easier to view than daguerreotypesAmbrotypes were mainly used for portraiture thus outdoor scenes are more rare No lateral reversal no mirror image The popularity of ambrotypes was short-lived however and the process was soon displaced by the growing popularity of the negative-positive process of collodion on glass negatives and albumen printsA Daguerreotype is a photograph that is produces on silver or on a silver covered copper plateA Collodion
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