INHERENT VICE (Exploring the title)

[Ya Sam]

EXPLORING 

INHERENT VICE: STRUCTURES

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Sulfiding—This is the formation of silver sulfide when silver reacts with sources of sulphur. This can result from the presence of sulphur in the atmosphere, but it is most often due to inadequate washing that leaves behind residual processing chemicals (fixers) in the print. The result is yellowing, staining, and fading of the image, usually beginning with the highlights.

Redox—The visual results of redox reactions vary depending on the type of image, but generally they include loss of highlight detail, fading, and change of image color to reddish, yellow, or yellow-brown. Silver mirroring (formation of a bluish metallic sheen on the surface of the image) is also a result of oxidation-reduction, and is particularly characteristic of silver images suspended in a gelatin binder.

BindersVarious materials have been used as binders (in which the image-forming material is suspended) for photographic prints. Albumen (egg white) tends toward chemical reactions that cause it to yellow over time, which is exacerbated by the presence of residual fixative and mounting on poor-quality board. Albumen also becomes brittle and subject to cracking. Collodion (cellulose nitrate) is not flexible and becomes brittle, leading to cracks in the emulsion, but otherwise is fairly chemically stable and does not yellow. Gum arabic was used as a binder for gum bichromate prints, which are stable but rare because they were difficult to produce. Gelatin, the most common binder material, is made from animal proteins. It is fairly stable chemically but is quite sensitive to moisture in the air.  etc,
http://www.preservation101.org/session2/expl_iv_cs-photo_bw.asp











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