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Posts: 13,005 Join Date: May 2006 Location: Houston mostly, Texas Real First Name: Wayne Camera: 6x7 Pinhole. Good enough for me. Can Others Edit My Photos: Yes iTrader Rating: 1 LIKES Received: 70 LIKES Given: 6 |
01-20-2011, 01:33 PM
Assuming the chemistry to be approximately equal to what we use today, if you can count to 4 & tell time, that's all of the technical stuff you need to know. The steps are always done in the same order. Like digital. Grinning.
A couple extra steps related to display. Quote:
AmbrotypeFrom Wikipedia, the free encyclopediaJump to: navigation, search
Many ambrotypes were made by unknown photographers, such as this American example of a small girl holding a flower, circa 1860. Because of their fragility ambrotypes were held in folding cases much like those used for daguerreotypes
“A Veteran with his Wife”, Hand Tinted Ambrotype c. 1860The ambrotype (from Ancient Greek: ἀνβροτός — “immortal”, and τύπος — “impression”) or amphitype is a photograph that creates a positive image on a sheet of glass using the wet plate collodion process. In the United States, ambrotypes first came into use in the early 1850s. The wet plate collodion process was invented just a few years before that by Frederick Scott Archer, but ambrotypes used the plate image as a positive, instead of a negative. In 1854, James Ambrose Cutting of Boston took out several patents relating to the process and may be responsible for coining the term "ambrotype".
In the United Kingdom it was called collodion positive: one side of a very clean glass plate is covered with a thin layer of collodion, then dipped in a silver nitrate solution. The plate is exposed to the subject while still wet. (Exposure times vary from five to sixty seconds or more depending on the amount of available light.) The plate is then developed and fixed. The resulting negative, when viewed by reflected light against a black background, appears to be a positive image: the clear areas look black, and the exposed, opaque areas appear light. This effect is achieved by coating one side of the glass negative with black varnish. Either the emulsion side or the blank side can be covered with the varnish: when the blank side is blackened, the thickness of the glass adds a sense of depth to the image. In either case, another plate of glass is put over the fragile emulsion side to protect it, and the whole is mounted in a metal frame and kept in a protective case. In some instances the protective glass was cemented directly to the emulsion, generally with a balsam resin. This protected the image well but tended to make it darker.
The ambrotype was much less expensive to produce than the daguerreotype, and it lacked the daguerreotype's shiny metallic surface, which some found unappealing. By the late 1850s, the ambrotype was overtaking the daguerreotype in popularity; by the mid-1860s, the ambrotype itself was supplanted by the tintype and other processes.
Ambrotypes were often hand-tinted. Untinted ambrotypes are grayish-white and have less contrast and brilliance than daguerreotypes.
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Wayne
Deep in the darkest heart of the East Texas Rain forest. Fledging Apprentice Wannabe Analog Activist My Gallery | FlickrMyBookTwitSpaceFace
Last edited by venchka; 01-20-2011 at 01:36 PM..
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