if you like you can clip a little bit off the start of the roll and guess a time . all you will do though is increase the contrast. try about five times longer than usual. try rating 400 speed at 200 and process normal, 100 at 50 etc. most b &w film appreciates over exposure a little. just try all different ways to come up with somthing that noone else know about.(posted 8566 days ago)