Fortunately, I used to be a Special Effects artist in my youth and used to make my own blood, blood capsules and other fun prosthetics for stage and film.
So just before we moved into the theatre I spent (Canadian) Thanksgiving weekend making washable stage blood. My eight-year-old daughter wanted to help and was my assistant during the process.
The best part of this fake blood is that it is washable from clothes and skin, and is completely edible (which works great for blood capsules).
Corn Syrup - (500ml) 2 cups, 2 tbsp (clear is better for this effect)
Chocolate Syrup - 1/2 cup
Hot Water - 1/3 cup
Cold Water - 1/8 cup
Corn Starch - 1/2 tbsp (heaping)
Coffee Mate - 1 tbsp (heaping) (Yes, CoffeeMate - This is the ingredient that makes the blood washable)
Red Food Colouring - 1 tsp
Yellow Food Colouring - 1/3 tsp or a drop *
* Note: Make sure your actor is not allergic to corn, MSG, Red #2 or Yellow #5.
Pour the corn syrup and chocolate syrup into a pot and start to heat on medium setting.
In another bowl use the 1/3 cup hot water to dissolve the Coffee Mate. Once the Coffee Mate is dissolved add in the food colouring.
Mix the food colouring into the Coffee Mate:
Add both the dissolved corn starch and the coloured Coffee Mate mix to the pot:
Bring to a slow boil. It does not need to cook very long, but the high heat combines the ingredients far better than no heat at all:
The result is pretty remarkable. Anyone who has ever used food colouring knows how badly it stains. Here I put a drop of the newly made fake blood on my hand (on left in center of palm) as well as a drop of food colouring on its own (on right - near by fingers):
Then simply wiped both off with a paper towel. As you can see the food colouring stained my hand but there is no trace of the fake blood:
During the run of the show, any of the blood that dripped on the costume was cleaned off with a Baby Wipe.
This recipe can be doubled or reduced according to needs.
This fake blood also tastes good on an ice cream sundae!
For the show, we also had one of the characters cough up blood after being shot. Since we had edible fake blood we made our own blood capsules for the actor to use in his mouth.
First I purchased a small quantity of empty capsules from a local pharmacy:
Using an eye dropper we carefully put our fake blood into the larger side of the empty capsule:
Then capped it with the small side of the capsule:
The capsule is now ready to be used. It will not dissolve the capsule, but the capsule will melt within a minute of being put in the mouth, so be aware of the need to block a way of putting it in the mouth within that timeframe. It will last longer if the capsule was made recently, as opposed to a few days earlier, but not much. You can experiment to see what works best for your production.
Tasty and won't stain. (Ice cream optional)