What you need1/2 bottle of light corn syrup
Red food coloring
Place the corn syrup into a bowl and mix in some hot water.
Add a small amount at a time until your have a nice consistency (not too runny, not too lumpy).
Add a few drops of liquid soap which will help with the clean up later and keep the blood moist on the skin.
Stir through the red food coloring.
You can darken it will a little green or blue if required.
Store in a fridge and just apply to the skin where needed!