Apply bleeding powder to skin with a makeup powder puff and dust until the powder becomes invisible. The more you use the darker the blood effect will be. Water activates this product, so when you drag a dull but wet knife across your actors skin it will look like you're cutting them. Lightly flog your actor with a damp whip to look like you're opening huge gashes. Hit actor with a damp safety hammer to leave welts, or mist with a water bottle to produce instant rashes.