I picked up a Photo Formulary PT/PD Kit to experiment with and most of the negatives I want to try are Polaroid Type 55 Negatives. Does anyone have any recommendation on mixture ratios as a starting point? Also since Type 55 develops to a fixed contrast will an ideal mixture work perfect for most fully exposed full range Type 55 Negatives? Any insights would be appreciated. I will be printing on the COT320 and I would like to favor a more neutral color print if at all possible.