Meanwhile, I AM doing more tests. The trouble is that life tests may require a long time. That would be good. I put a few ounces of the latest all K metolal in my brisker at 104 F to age for a week or so. If it still works, I'll do another test every week until it does not work. The attachments show the first test. The film is EDU 400 Ultra. I also have HP5+ and FP4+ that I will test.