Alan: You can use stop bath (Ilford or other one) in both papers and film. Recently Ilford recomended not to use stop bath (acid) in Ilford Delta Films. The diference betwen pH (acidity) of deveop and fixer is strong and you can see some pinhole in your negs. Try to wash several times with WATER before fix your neg or dilute your stop bath. Have you ever use Ilford Delta 100 or even 400?(posted 9624 days ago)Mauricio