In looking for info on something else I came across a test done by Dr. Richard Henry on the effects of temperature changes(posted 8739 days ago)He tested Pan-X, Plus-X and Tri-X by taking one batch abruptly up from 68F to 75F and another batch abruptly down from 75F to 68f....and measured _no_ significant differences in granularity or acutance and certainly no emulsion damage.