why is rust sometimes considered bad and sometimes good? isn’t all rust eventually bad?
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Rouge (red iron oxide) has been used for centuries as a pigment for cosmetics and paints – even by cave men! It is also used as a polishing agent, for which a very fine particle size is required.
It is used as a corrosion inhibitor and sealant in primer or undercoat paints. When painted directly on bare iron or steel, the iron oxide reacts with the metal surface and “bites in” to the surface, giving a very strong bond. It has low porosity to moisture, and is used to paint bridges.
Red iron oxide of a very high purity is used to color pharmaceuticals.
Iron oxide is also half of the active ingredients of thermite. You mix iron oxide and aluminum powder together and when you ignite it, you get the thermite reaction which will weld steel together.
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