fixer

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fixer

Photog a solution containing one or more chemical compounds that is used, in fixing, to dissolve unexposed silver halides. It sometimes has an additive to stop the action of developer
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Fixer

 

a mixture of chemical compounds that converts the undeveloped silver halide in a photographic emulsion into watersoluble complex salts. The primary constituents of fixers are usually thiosulfates, chiefly sodium thiosulfate. Fixers are applied in the form of an aqueous solution or paste.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.