The initial agitation should be 30 seconds. Place the tank in the sink on its bottom (cover up). 5. Once every minute, agitate the film for 5 seconds by slowly inverting the tank end to end.
Most procedures call for only thirty seconds in the acidic stop bath. Some stop baths such as Kodak's Indicator Stop Bath changes color when the effectiveness of the chemical solution has expired. This stage only requires one initial agitation.
 See also: Photograph, Temperature, Fixing, Fast, Stop bath
  
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