Made a cute zombie cake for a young boys birthday over the weekend. Got to practice my blood making skills (ewwwwwwie). But seriously, this stuff was AWESOME! It made a bright red pipe-able (is that a word?) gel and it did not take any special ingredients whatsoever. Mine dried to the consistency of jello, however, you could make it thinner for blood spatters (eww) or let it set some before piping to give it a different consistency overall. I will share the recipe below though so you can make your own awesome cakes with this gel. It could be used for other things as well like blue for water!
Piping Gel Recipe
1/4 cup white corn syrup
1/4 cup water
3-4 Tablespoons corn starch (more or less depending on what you are using it for, I used 3 Tbsp + 1 tsp and it dried/cooled really thick like jello)
Stir together ingredients in a microwavable bowl. Heat for 1 minute and 30 seconds or until mixture boils. Remove from microwave and stir with a whisk. Add desired colors!
You can also add in some vanilla or other flavor if desired.