I've been in medicine for close to 20 years, as a paramedic and a nurse. I've seen a lot of crime scenes and bladed weapons used in these. Blood could corrode a blade, but the "stain" as far as we know it, would never remain. Blood is made up of cellular tissue that clots, dries, and flakes off. If we were talking about cloth/textiles, it would be a different story.
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