Blood contains coagulants that causes the blood to 'dry' or 'clot' quickly. It most certainly is corrosive. But if you just take a quick swipe at metal with a thin layer of blood then there will be just a light corrosion witnessed on the bluing. If the gun has layed in a pool of blood, then the results would be heavy corrosion and pitting. A drop of blood would leave a shallow pool type of corrosion appearance but pitting would be slight because the blood would clot before deep pitting would occur. So everyone in the above discusion are correct, depending.
Water,on the otherhand, is acidic but does not clot and so it will stay on the surface longer depending of external conditions. Deep pitting and a different type of surface distruction would be encouraged.
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