I've managed to finally get some decent prints using the B&S Ferric Oxalate 1 and 2 solutions, and just got their Na2 Kit. But I need some advice as to a starting point. I'm doing my current prints at 1/3 2/3 ratio both for platinum to palladium and the Ferric Oxalate solutions - for 12 drops of palladium what's a good starting point for how many drops of the Na2 solution? (there's no indication if the Na2 is 5, 10 or 20% concentration)