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Anything deteriorating. for this was a fingerprint, lifting it would be difficult. skin is porous and strefs easily. two things that make it impossible to get a usable print. the odds of getting a bloody print on a body is very slim. the area around the fingerprint was treated with a chemical that reacts with the proteins in blood. the stain makes a print visible. as in this simulation with a print forming on skin, it enhanced the ridge detail of the fingerprint created in blood. any time you have a lot of blood, it will actually cover up your ridges so the less blood there is, the better print would be when you cross it with amino black. the very small places that had the tiny bit of blood, that s where i got the print. ....