You will need:
1 Cup of corn syrup
One teaspoon of red food coloring
2 drops of blue food coloring
A teaspoon or so of cocoa powder
Flour and water
Step 1: Mixing
Pour the corn syrup into the bowl add the food coloring (All of it) and mix.
Step 2: Cocoa Powder
Slowly add cocoa powder and continue stirring the mixture.
Step 3: Done
let it sit for ten Minutes at room temperature the stir some more. If its to thin add flour if its to thick add water.
WARNING: This recipe makes a lot of fake blood. These pictures are not mine they are pictures of my computer screen, I did make this recipe yesterday though.