Make Washable Blood
There are many types of ‘blood and wound’ effects that can be made up for film.
It depends on what type of wounding or ‘bleeding’ is needed for the scene i.e. cut throat – gushing blood, torn wounded flesh – coagulating blood etc. to what you need to make.
If you are new to this I strongly recommend that you study up on the different visual stages of bleeding, wounds and bruising before getting into making these effects.
Washable blood is handy to have if your actors have to wear the same costume usually a few times for scenes before the actual ‘bloody scene’. It saves on the wardrobe/costume budget.
If it is for a particularly gory blood spraying scene, you are likely to have to make gallons of the stuff, so be prepared.
The main ingredients are liquid ...