I do that all the time also, thats why I am trying to mark all my finished rolls, (I don't know how my unused rolls get mixed in with my used rolls either, maybe the unused ones get jealous and jump to the door of my fridge?!?) otherwise, there are three posibilities: 1:> it was and unused roll 2:> the development got messed up somewhere along the way and you blanked the negs when you pulled em' out to look at them. 3:> you got a "cursed" roll, one in a million... (check those dates!!)(posted 8696 days ago)thats all I gotta say... Jason Tuck