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Chemical fog
An even, overall density on film or paper. It is exaggerated by over development.
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Serious chemical fog and developer changes can be caused by tin, copper, brass, and bronze. Aluminum, lead, nickel, zinc, galvanized iron, and Monel, when used with developers and fixers, can be harmful to films and papers.
Excessive accelerator can result in chemical fog, excessive grain, soft emulsions, and short shelf life. Accelerants are an akali, commonly sodium or potassium hydroxide, sodium carbonate, kodalk, or borax.
This conclusion was supported by further experiments, in which reversal was obtained by replacing the second exposure with chemical fogging agents, which undoubtedly eliminated all optical shielding.
Fog. Allowing random light to reach light-sensitive material, as in opening the camera back accidentally or leaving a packet of paper open. Also caused by bad storage or contaminated or over-prolonged development (chemical fog).
 See also: Film, Fog, Development, Photograph, Developer
  
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