Now we have a nice thread on RA-4 filtration, so i'd like to ask you another thing.
How much do different processing chemicals effect your filtration? I have been quite surprised that the color filtration seems to be quite stable for a given negative-enlarger-paper combination regardless to which chemicals I have used as long as they are fresh or properly replenished. Even changing from Tetenal room temp chemicals to 35 C degree processing with Paterson chemistry made only around 2,5M difference with the neg I was printing.