Amidol is a colorless crystalline compound with the molecular structure C6H3(NH2)2OH. The dihydrogen chloride salt is used as a photographic developer. It was introduced as a developing agent for photographic papers in 1892. It is unusual amongst developers as it works most effectively in slightly acid conditions rather than the strongly alkaline conditions required for most other developers. As amidol ages it changes color to a dark red-brown. Developing dishes and equipment used to prepare amidol solutions are also frequently stained brown, a stain that is very persistent.
Prints developed in amidol are typically a very warm brown-black colour but overdevelopment can quickly lead to chemical fogging
References
This article is licensed under the GNU Free Documentation License.
Last updated on Thursday July 31, 2008 at 05:49:50 PDT (GMT -0700)
View this article at Wikipedia.org - Edit this article at Wikipedia.org - Donate to the Wikimedia Foundation
|
|
|
|
|
|
|
|
|
|
Copyright © 2009, Dictionary.com, LLC. All rights reserved.
