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Dig up the MSDS for it if you can. It should tell you something useful. The one caution about all of the rouges that have waxes in them is that the wax can obscure the scratch pattern and make the...

Red rouge can contain aluminum oxide along with the iron oxide. I don't know how common that is. I have a 2 pound stick of red rouge from mcmaster carr that has both iron oxide and aluminum oxide, I...