There are about 3 chemical compounds that can be formed from iron and oxygen.  The red colored form, rouge, is used for mirror polishing.  Another form, rust, will scratch instead of polish. I know of two other people besides myself that have used rouge because they wanted to polish more slowly. All of us ended up with scratches. I now use only cerium oxide and agitate a mix of cerium oxide and water before drawing off a bit for polishing.

A friend has used 'black rouge', Fe3O4.  He tells me that it makes a very bright, high polish.  Ref

If you like to stay on good terms with 'significant others' remember that iron oxide is very good at making rust stains.

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