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Causes for uniform base fog

MattKing said:
HC-110 needs to be used in very specific ways if you want to minimize fog. I wouldn't come to any conclusions based on this particular data point
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How should I use it for the last roll? I won't shoot anything important with it but I think it will be fun to try minimizing the fog. I suppose the best test would be developing the last roll with d-76 and comparing fog with new hc-110 Dil B?
 
AFIK, there are 4 types of fog with paper and film.

1. Age of material
2. Storing materials in a heated environment for prolong periods.
3. Light
4. Chemical.
 
HC-110 at slightly lower temperatures and with relatively less, very gentle agitation maximizes its tendency to minimize fog.
 
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