I just lost a portion of a bulk roll because the sleeves of my film changing bag are not completely light tight. Put a strong flashlight inside your bag and try and shine through the sleeve material. I could just make out the flashlight through the material and it was enough to fog 400 speed film while in the bag for about 15 minutes. I am talking about the common, garden variety changing bags that sell for around $30, i.e., Ross, Adorama, etc. I am now using my Harrison sheet film bag for bulk loading. No problem.
Last edited by Fred Aspen; 12-19-2012 at 05:38 PM. Click to view previous post history.