which film(s) are you getting in bulk? Are the kaccema hard to get hold of?
Sodium Thiosulphate. I found this note on page about reversal processing:
I'm confused about the idea that it might reduce density, as that would make a darker positive. But I wonder whether it be used to get a touch of contrast increase by clearing the hilights?Basically the developers used in reversal processing are print developers with the addition of hypo (sodium thiosulphate), the amount of which should be varied to suit the film. I've read two accounts of what is accomplished by adding and varying the thiosulphate. One school of thought is that it increases the contrast of the developer, the other is that it reduces the density of the resultant image. It may be that both are true and that the density loss occurs more extensively in the highlights