I love this post from wikiHow on how to make fake blood for Halloween. This is the best mix of recipes I've seen so far because it shows you a non-toxic version, a toxic (more authentic) Hollywood movie set version, an edible version for cakes, splatter blood (ha!) and even blood for art.
Here's my friend Susan's version of non-toxic blood that I used several years in a row for my zombie prom Halloween costume:
- Arrowroot powder (or corn starch, but Arrowroot makes for a less clumpy mixture)
- white corn syrup
- basic red and blue food coloring (green works too if you don't have blue)
Start with a cup of corn syrup in a bowl. Stir in a tablespoon of Arrowroot powder or cornstarch. Slowly add in water (up to 1/3 cup) until you get the perfect consistency of blood. This is your base.
To add the dye, add a few drops of red food coloring, stirring it in until you have a bright red color. Add a couple drops of blue or green food color to make the "blood" look more authentic. Set aside to thicken, then apply to face, clothes or body. Warning: This fake blood will stain clothing!
Image: Photodisc for Getty Images