JDEF-you are absolutely right. Besides the fact that the Xtol is costing almost $10 a package Using it 1:1 it goes fast with sheet film. I just finished the tests with Hp-5 and Jand C 100. All look promising. I think I'll just break down and order some TEA. The iso-propyl works fine but I need to mix larger batches and don't want to experience failure.