WIRED ScienceWater, Flour, Syrup, Dye: Mastering the Elements of Fake Blood
The internet is oozing (dripping? spurting?) with recipes for fake blood, but to get the exact color and consistency your Halloween costume calls for—be it bright and wet or dark and crusty—your best bet is to brew your own bloody concoction. To do it, it helps to know the properties of blood that you're approximating and the non-biohazardous ingredients you can use to imitate them.
