Out of Curiosity. When I worked with Microfilm, We were always to ask for a "Methylene Blue" test that said the film was washed "sufficiently". I only saw a consultant once with a bunch of dropper bottles and a penchant for only working when he was alone.
What is the difference between the MB test and the Silver Nitrate test that we are discussing here. Would sending some of the Doubters off to repeat this test sequence with Methylene Blue help the cause?