Could a metal be indefinitely stained by human blood?

Say there's an in-universe weapon so odd looking that it is rumored to have been stained by the blood of a "holy" mortal, so much so that no amount of water can wash it away.

Is there a chance human blood can stain metal through time, or is there a metal that could give off this impression to befit the rumors better?

Edit: I realize I was being confusing: No magic is involved, it's simply a rumor to discourage regicides of "God-chosen" monarch.

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Could a metal be indefinitely stained by human blood?

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