Fake Blue or Green Blood Recipe

Recipe for Fake Blue or Green Blood

You can make use this edible fake blue blood for insects, spiders, crustaceans, and maybe aliens.
You can make use this edible fake blue blood for insects, spiders, crustaceans, and maybe aliens. Anne Helmenstine

​This is a recipe for an edible fake blood which you can color blue or green for insects, spiders, and other arthropods, or perhaps for aliens. Spiders, mollusks, and several other arthropods have light blue blood because their blood contains the copper-based pigment, hemocyanin. Hemoglobin is red; hemocyanin is blue.

Ingredients for Blue or Green Fake Blood

This simple recipe only requires a few basic kitchen ingredients:

  • Light corn syrup
  • Corn starch
  • Blue or green food coloring or unsweetened drink mix

Make Fake Blood

  1. How much fake blood do you need? Pour that amount of corn syrup into a bowl.
  2. Stir in corn starch until you achieve the desired blood consistency. The blood will thicken as the water in the corn syrup evaporates, so if you are using the blood for a Halloween costume, for example, expect the blood to be thinnest when you first prepare it.
  3. Add food coloring to achieve the desired color.

A variation of this recipe is to make a fake blood gravy, in which you heat the corn syrup to boiling and add a corn starch dissolved in a little water. This produces a translucent blood. If you cook the blood, be sure to wait until it has cooled before you use it.

Make It Glow

While spiders and mollusks don't have glowing blood, you might want a glow-in-the-dark effect for show. To get the fake blood to glow, stir in some phosphorescent powder (available online or in craft stores). Note the the original recipe is safe enough to eat. Glowing blood is non-toxic, but should not be ingested.

Fake Blood Clean-Up

This fake blood can be cleaned up using warm water. Since it contains food coloring, avoid getting it on surfaces which would stain, such as clothing or furniture.