To create an 'open wound', the Derma Wax construction has to be 'cut open' with the sharp side of a Derma Wax spatula. Lubricate the tip of the spatula with a little bit of Cleansing Cream. This will allow the spatula to slide more easily through the Derma Wax, preventing it from sticking to the spatula. Make a cut in the Derma Wax using the sharp side of the spatula.
First you colour the wound black, using a brush, to suggest depth. Then apply a little dark red Crème Make-up and finally add Filmblood or Blood.