[Frameworks] Making clear leader

[Scott Dorsey]

B&W film will bleach with Farmer's Reducer or reversal process bleach.  The
image is a silver image, so what you're doing is reacting with the silver to
form a soluble salt that you can clear out.

However, the B&W emulsion is also designed for low temperature processing
so another route is to put it in very hot water and just dissolve all the
gelatin right off.  I once sent an edited negative containing color and B&W
sections to Commonwealth Film for processing.  Even though the can was untaped
some bozo ran the whole thing through the color processing machine and the
B&W sections were all perfectly clear afterward because the emulsion was all
completely removed.

Color film is going to be more problematic... if it is long perf it's probably
best to just use it for soundtrack fill...
--scott