"In addition, it is well known that the longer a film is wet the more grain migrates (clumps) to make grain appear larger." - What?. This is sheer nonsense. Some of the finest grain developers also have the longest development times. I think this disproves that 'well-known' theory, but by all means test it.(posted 8537 days ago)
Take a fine grain negative and print it, then put it back in the wash for, say 4 hours, dry it, and print it again. If the grain is increased, I'll gladly donate a tenner to the charity of your choice.Gross temperature differences between processing baths can give rise to 'reticulation'; a micro cracking or wrinkling of the gelatine. It can look like severe grain, but isn't grain at all.