This could be a long shot, but there is a wonderful Pharmacy/lab supply here in Milwaukee and the guy has never failed to procure a chemical for me. He got me DTPA when I was trying to homebrew Xtol (it works fine but now I am hooked on Tmax 400 in Pyrocat MC). The company is Laabs and you must ask for Brian. Tell him it is photo stuff, he was a B&W photographer and tell him I referred you. Phone 414 342 0145, ask for Brian in Chemicals...Evan Clarke
Thanks Evan, I'll give him a call.
"The secret to life is to keep your mind full and your bowels empty. Unfortunately, the converse is true for most people."