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citric acid
an organic acid used in testing the acid resistance of ceramic colors.
In small scale darkrooms, stop bath may use citric acid or other organic acids, or simply plain water.
You thought you'd take that old SLR out for a spin, but you realized you left the old batteries in and they're completely encrusted. If they were alkalines, you'll need an acid to get rid of it. Citric acid on a Q-tip works wonders, ...
 See also: Acid, Photograph, Time, Exposure, Alkali
  
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