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Turning your negatives into positives Reversal processing enables black and white transparencies to be produced directly from high quality films such as PAN F Plus, FP4 Plus and DELTA 100 PROFESSIONAL How it works It starts with the development of the negative image. This leaves the unused silver halide untouched, but it is not fixed, as it will be used later to form the positive image. After the negative image has been developed, it is totally bleached away using an acid bleach. This leaves the remainin...