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I Forge Iron

Composition of scale

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This is a question for a blacksmith/chemist.

When I forge mild steel a lot of scale piles up around the anvil. Is this scale chemically similar to magnetite (Fe2 3O4). I meed a couple of ounces of powdered magnetite for some hand made electrical inductors. 

Powdered magnetite is available commercially but I only need a couple of ounces and I have a lifetime's worth of scale around the anvil. 



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