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I think the reversal process requires a positive black and white developer ideally. A hypo agent like Sodium Thiosulphate (1 teaspoon for < ISO 100, 2 teaspoon > ISO 100) can be added to the first developer to temper the film development. You'll also need a second development stage after the fogging (reversal) to properly prepare the film for the colour development stage. 1st developer 1:5 concentration ( 12 mins < ISO 100), 2nd Developer 1:9 concentration ( 4 mins < ISO 100, 6 mins ISO 200, 8 mins ISO400).