Thanks, guys. I'll get some litmus paper (though I may have some around somewhere...or I'll hit up the Chemistry Dept for some) and will aim of a pH of 6...I have plenty of Oxalic acid. I have some crystals in the bottom of the jug, so I'll add a little water.
I'll have to get some more potassium oxalate, too. I spilled a little during my last printing session and I have barely enough to print with. Hate doing that, but sometimes the old brain/body connection falters in the wee morning hours.
PS...my guess is that my pH will be good -- I generally use an Oxalic acid treatment on my paper (soaking the paper a couple minutes in a 5% solution) before coating.