Blood was puddled on the top of the plastic cover of the sponge sheet to the extent that it just did not flow off, which required about 4 ml. at the beginning and frequent renewals with 1 or 2 ml. of blood. Heavy enough blows were dealt that at least with one object (the heaviest bar), the plastic sheet and rubber sponge were cut completely through to the underlying wood. One such cut is shown spread with forceps in in this photo. The paper strips were removed from the walls after each series of blows and photographed.
Paul L. Kirk investigation, forensic testing, impact blood spatter experiments