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Combine corn syrup, food coloring, and cornstarch to make realistic blood. Use creamy peanut butter and corn syrup to make things look bloodstained. Apply the fake blood with a syringe or dropper to make it seem authentic. Smear the fake blood with a sponge or scouring pad. Make blood squirt using plastic tubing and a syringe. Create blood spatter with a spray bottle.
Mix together 2 cups (470ml) of corn syrup and 1 cup (240ml) of warm water in a large mixing bowl. Pour in 10 teaspoons (49ml) of red food coloring and a few drops each of blue and yellow coloring. Stir in 1 tablespoon (7.5 g) of cornstarch at a time until it's thoroughly mixed, and keep adding it until there are 10 tablespoons (75 g) in your mixture. This style of fake blood is somewhat sticky so it will stay in place when you apply it, but it won't run as easily. Try adding cocoa powder if you want your fake blood to look darker. Use less cornstarch if you want the fake blood to flow easier. This recipe is edible so you can apply it in or around someone's mouth. Pour 10 teaspoons (49ml) of red food coloring and 1 cup (240ml) of light corn syrup in a mixing bowl. Combine the corn syrup with 1-2 heading spoonfuls of creamy peanut butter and stir the mixture together until it's thoroughly mixed. Apply the fake blood by hand and rub it on a surface to make it look like it's coated in a thin layer of blood. If you want to make the blood look like it's dried up or scab-like, try using chunky peanut butter instead. Keep in mind that it may be harder to work with and apply. This fake blood is edible so it's safe to use near someone's mouth. Pour your fake blood mixture into small syringe or dropper bottle so you can easily apply it. Squeeze the bottle or depress the syringe slightly so a small amount of blood comes out. Let the fake blood drip down the surface you're applying it to so it looks realistic when it's on camera. Be careful not to get the fake blood in anyone's eyes since it could cause irritation. You can apply fake blood in and around a person's mouth if you need to as long as you're using an edible recipe. Dip the corner of a scouring pad or sponge in your fake blood and dab it onto the surface you're applying it to. You can either lift and dab the blood to apply it in a pattern or you can wipe the blood across a surface to make smears. Try a few different techniques on the surface to see what works best when you apply it. Test different applicators to see what textures they make with the fake blood. For example, a steel wool pad will cause the blood to bead up while wiping it with a sponge will look flatter. Attach a syringe to the end of a thin plastic tube and fill the syringe with your fake blood. Put the other end of the tube next to where you want the blood to spray so it's off camera, and tape it in place. During your shot, have a person off-camera press down on the syringe slowly so the blood squirts out of the tube. This method works great to simulate blood squirting out of a pulsing wound. This may not work if your fake blood has a thicker consistency. Pour your fake blood into an empty spray bottle and make sure the nozzle is on. Pull the handle on your spray bottle to create a mist of blood that spatters on the surface you're applying it to. Apply as much or as little fake blood with the spray bottle as you need to for the scene you're shooting. You won't be able to spray fake blood that has a thick consistency.