Iron isn’t red, is it? At least, not the kind that magnets stick to. It’s that shiny metallic stuff. So, why is it red in our blood?
It has undergone a transition into an ionized state, and is bound into molecules. The iron in our blood has the same number of protons as metallic iron, but is ‘in a completely different situation’ and does not interact with magnets in the same way.
As a sidenote, magnets actually *do* interact with humans. They very weakly repel us.
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