Conrad, its function in FX-2 is as a restrainer, so it should lessen fog. Supposedly with t-grain, crystal grain, and the other "modern emulsion" films it is not recommended. Why, I don't know. Perhaps they are less prone to fog. In any case, I've found, as you seem to, that using it or not doesn't seem to have much, if any, affect on any film.(posted 8258 days ago)