I just finished a Michael Smith workshop. It's funny, after all I read about Azo and Amidol...everything from toxicity to his exacting formula, I expected to have to wear one of those hazmat suits and have a high school chem lab to mix the stuff. But is amazingly simple. Easier than most other developers I have used over time. And there really is nothing like a contact print on Azo with those Amidol blacks and midtone separations.