Corn syrup (golden syrup
Red, blue, and green food coloring
Flour, cornstarch, chocolate syrup, or maple syrup
Combine one part water with three parts corn syrup Add drops red food coloring gradually and mix gently by stirring. Continue adding drops until the shade resembles that of real blood (always err on the side of adding less, as it's easier to add more). Add a small amount of blue or green food coloring to achieve a more realistic shade. (Arterial blood is bright red, while venous blood is a dark maroon). Dry thickener. Add sifted flour or corn starch to your mixture, and whisk or stir it gently until smooth. If small lumps form, wait about a minute and the lumps will float to the top where you can remove them easily. Note: you can also use glycerine instead. Wet thickener. Stir in thick chocolate syrup until the desired consistency (and optimal flavor) is reached. You can also use pancake syrup to add a brown tone and make the blood a bit thicker and stickier. Don't use too much!