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I was forgeing on a section of coil spring and after it cools it looks like rust. What would cause this? I was cleaning the steel with a wire brush when forgeing. I had this happen before and after grinding it goes away. I’m just curious if it’s the steel or the atmosphere of my forge? I have a single burner propane. 




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That's more a function of the humidity in your shop.  Red scale is hydrated iron oxide, gray/black scale is anhydrous.  Doesn't mean much.  

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