I'm old enough to remember stripping film. That was a series of graphic arts films where the emulsion could be removed from the base and transferred to another support. It was used for lateral reversal of halftone negatives. I remember seeing an expert strip a 10X12 negative from a film base and transfer it to a glass plate. These materials were in declining use in the 50s and were discontinued in the 60s. Does anyone know anything about the structure of these films? In particular, how were they made so that the emulsion could be easily removed? I was thinking that some variation on this technique could be very useful in alternative process printing, especially for gum-like processes and carbon.