>Well, I never said you used the wrong stuff. I just said that iron >oxide is rust. Phosphoric >acid actually works by removing the iron oxide (rust). In fact it doesn't remove the rust, it alters it chemically to a pretty-much insoluble & inert iron compound, but I'm not sure which. Possibly iron sulfide (of which one form, marcasite, is chemically active, and the other, iron pyrite, is not). |
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