Quote Originally Posted by Photo Engineer View Post
Sorry, but not true. The blue "sparks" can cause marks and lines on film as you pull it away from the film or from anything nearby the film such as the original roll. That is why I cut mine.

Exactly PE. Right on.
That's what happened to me last night. I messed up with a pre-cut adhesive tape (I have a red 3M adhesive tape - core series 2 1300) right on the spool (both estremities of the tape decided to stick together at one point). When I tried to tear them apart: bang. A rather dim but discernable spark. With the 17mt bulk roll near! Hope I didn't ruined anything...