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

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.