Quote Originally Posted by Donald Miller
Tom,
Thanks for the update. The question that I have is why use film to check amidol activity?, or is this simply because the film is much more susceptible to determination of Amidol activity?, or... are you wanting to arrive at a new film developer based on Amidol? Thanks again for your continued service...
Hi Don, I used film as an activity/no-activity test article because it was convenient - it's what was immediately available in the lab I was using.

My Amidol interest at this point is in the development of Azo contact prints - not film.

My observation (today) that the developer produced substantial visible stain on the piece of test film led me to check it out with the densitometer.