Potassium Dichromate Bleach

I mixed up some Potassium Dichromate bleach to do some reversal processing and the first 3 rolls I shot looked great! Once I got to the 4th one, however, the film started looking a little bit more dense and I had a loss of overall contrast. I initially thought that I just had a light leak issue, but know I'm wondering if the bleach is becoming exhausted, however. I knew that I could not keep re-using the stuff forever, but I thought I would get more life out of it than that. If I extended bleaching ...

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