Thanks again, part of what what was initially confusing me is some people were combining different minerals & chemicals to get to the same end process. What I realize now is people were basically making their own manganese phosphate, when others just buy it in a bottle. I would rather not make it myself and add another variable it it. Doesn't seem expensive anyway pre made, just need a source to get it. I will look into Caswell.
Also, about 6 months ago I bought a bunch of fasteners from AMK. I thought these were all black oxide, but now looking in the book I ordered from it says they are finish S2 which is referenced as "phosphate". I would assume that is manganese phosphate even though it does't say that in the book? Here's a picture of a few of the fasteners. They are very black. not oily at all. If I could get mine to turn out like this I would be ecstatic
Here I had examples right under my nose.
