Mike, you are so right. It's very paper dependent and papers change all too often. BTW, you can use 151 Everclear if 190 is not available in your area. Just use a little more... I typically use 2 to 4 drops of 190 in an 8x10 print. But, realize that the Everclear drops are much smaller than the Pd or ferric drops due to the much lower surface tension of the liquid (which is also why the everclear helps smooth the coating, in my experience).