CHOCOLATE BLOOD

1. Combine light corn syrup with red food dye until you get a shade that closely resembles real blood. You can also use a red drink mix (like cherry Kool Aid® powder) instead of red food dye, although be warned that this changes the flavor. 
2. Carefully add a small amount of cocoa powder to the syrup mixture to darken the shade and cause the fake blood to turn opaque like real blood. 
3. Perfect the consistency. Either:

• Thin the blood by slowly adding water; OR
•  Thicken it with a couple pinches of flour or cornstarch mixed in carefully and slowly.