That reminds me of when I was a kid and took the Indian three quarters groove axe head that had been handed down in the family to the local archaeological society meeting. One of the guys told me that a stain on it was a blood stain. That seemed really neat. Over the time I realized it dated to the Archaic Period thousands of years ago and the old guy was probably pulling my leg. Then, over more time, I learned that scientists had been able to detect organic material on stone artifacts and identify different species of animals that had been hunted by Native Americans using different tools. I don't know if any of the tools were polished stone axes. I doubt polished axes were used for hunting, but they could have been used to smash bones for marrow.
I have also seen suggestions that certain types of corrosion on metals was due to contact with blood while others suggest that those claims are false. I've never researched the topic. I have at least one sword in a scabbard that shows evidence of having had the pommel removed and hand guard disfigured as if it was hit by an artillery shell fragment. If I recall correctly there is evidence that some sort of liquid gunk splattered onto the scabbard. It's not handy at the moment or I would dig it out and check. I have wondered if there was a cheap and easy way to see if it could be blood residue.
Bringing the