Hi, To your message about the toxic effect of Manganese, there is mention of it in the literature. I think I noticed it in early Adel Davis books, and there is mention in the 1973 book by Henry Schroeder, titled The Trace Elements and Man. I seem to remember in a current run-through of Medline there being a reference to Manganese. My husband used to paint primer on the inside of airplane wings with zinc chromate. This was years ago when they didn't use many safety features. I have found references to zinc and copper but not zinc chromate. Hope this is of some help. [log in to unmask]