In order to make fake blood for Halloween, you will need the following: a towel, a spoon, a container, red food color, white corn syrup, and blue food color. This will need to be done on a protected surface. You can use a towel to cover your work surface. Pour some light corn syrup into your container. Pour in enough food coloring to cover the bottom of the container. Add 20 drops of red food coloring. Stir it until it is even. Add one drop of blue food coloring. Stir it until it is well incorporated. You may need to add another drop of blue, if it has reached the desired consistency. If you need it to be runnier, then just add a little water to it.