Hardeners
The chemicals often used with a fixing bath to strengthen the physical characteristics of an emulsion. The most common hardeners are potassium or chrome alum.
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-Aluminum compounds - groups of chemicals often used as hardeners in fixing baths.
Hardeners commonly used in photographic processing baths are aluminum potassium sulfate, chromium potassium sulfate, and formaldehyde solution.
 See also: Emulsion, Hardener, Exposure, Film, Frame
  
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