That depends on what you are planning on doing with the negatives. For enlarging of Pyrocat HD negatives you will find that the negative densities will be more accurate if read on the blue channel of a color densitometer. Typically the proportional stain effect would be on the order of .15-.20 at a negative density of 1.20 above FB+fog if the negative was read on the visual or black and white channel. This stain effect will need to be considered or you will have negatives that are higher contrast then at first appearance.