This does not act like fog!
Leaving paper in the developer for such an extended time can cause darkening in even the best paper, and safelights can fog with such extended times in a developer. Therefore, by using such a long time, you get the worst of all possible conditions.
A 1 - 3 minute treatment in total darkness is a reasonable test for fog. After all, if it has not shown up by then it would not be "normal" fog and would probably not affect the print then either.
PE
Leaving paper in the developer for such an extended time can cause darkening in even the best paper, and safelights can fog with such extended times in a developer. Therefore, by using such a long time, you get the worst of all possible conditions.
A 1 - 3 minute treatment in total darkness is a reasonable test for fog. After all, if it has not shown up by then it would not be "normal" fog and would probably not affect the print then either.
PE
