It wasn't for an emulsion Lift Per se but a Chlorine removal of the light filter on the back of the NEG so you can scan. Thread link:> http://www.apug.org/forums/archive/i...p/t-76978.html
the Key to being able to scan through the orange filtered backing is to use plastic packing tape and press the edges on the negative backing to seal it well! then not to Roll with too much pressure on the moistened (not soaked) bleach pad! you can then scan your negatives and edit them accordingly without having to lift the emulsion or to get a preview before lifting. The Negatives preserve amazing shadow detail in Zones 1-3, particularly with underexposed positives! Good luck! I am working on a box to hold the drying negatives separate in the field to preserve them for later processing!