-Anti-fogging agent - constituent of a developer that inhibits or reduces fogging during development.
-Sodium hydrosulfite - used as a fogging agent in reversal processing.
-Sodium hydroxide - highly active alkaline accelerator used in conjunction with hydroquinone to produce high contrast developers.
Sodium hydrosulfite
Is used as a fogging agent in reversal processing.
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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.
 See also: Fogging, Processing, Developer, Development, Format
  
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