Response to HP5 Plus developed with PMK pyro

The previous answers are both correct, anti-halaion dye in the 120 format. However, the above answers did not address the 'thin' 120 negs. It's true that 35mm has a much denser base + fog, however the image density should be the same. HP-5+ has an honest EI of 400. I suspect that your exposure of the 120 film is under. It may be an inaccurate shutter, or if you are using different meters with each camera, one (or both!) may need calibrating. BTW, HP-5+ in PMK yeilds a ruler flat curve, making printing much easier.

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