Thanks JLN. It is a simple and informative article and a very doable project.
I have a science background but did not specialize in chemistry so I am curious of the chemical makeup of the black spots on many recievers I see. This is often left after steel wool and oil treament on a rusted, slightly pitted metal receiver. We have all seen it. The only response I have ever gotten about removing it is to sand the metal which I don't want to do since it may ruin or at least thin the engraving. Thoughts, suggestions or info?
