This Halloween trick is sure to terrify your friends and have you go down in history with the best prank of the year. Elaborate makeup with fake wounds and oozing blood are staples of gruesome Halloween costumes, but what about blood that appears without any wound at all? Imagine that you saw somebody get cut with a knife, and blood starts seeping from where the fresh wound. You'd be pretty freaked out, just like your friends will be when you pull this one on them.
This video shows you how to create the two solutions necessary for this trick. The first solution, a Potassium thiocyante formula gets poured onto your body in the place where you want the blood to appear. You then dip the knife in the second solution, a Ferric Nitrate formula. Use the blunt end of the knife (or better yet, get a prop knife to avoid any mistakes) and pretend to slice on the same spot that you applied the Potassium. The result: a stream of realistic looking blood as the knife is pulled down the skin. Check out the video, you'll be shocked at how convincing this one is.