Dichroic fog
Purple green bloom usually seen on negatives and caused by the formation of silver in the presence of an acid.
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Some photographers have encountered dichroic fog (an ugly brown metallic stain) on sheet film processed in T-MAX developer. The new T-MAX RS developer-replenisher should eliminate this problem with sheet film.
DICHROIC FOG-A deposit of colloidal silver on a photographic film caused by improper processing. This deposit commonly appears red by transmitted light and greenish by reflected light.
 See also: Negative, Silver, Green, Fog, Dichroic
  
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