Halloween is just around the corner! Maybe you need some fake blood for your vampire costume? Or maybe you just want to have fun doing some spooky science in your kitchen this weekend.
In this month's 20 Minute Lab, we'll make costume blood using everyday items from your baking shelf!
Did you know in old black and white movies that they used to use chocolate syrup for blood? But that won't do in our real world of color!
Also, to make fake blood look real, the liquid needs to be thicker than just red-colored water.
In this experiment, we'll create thick, dark, realistic-looking blood. You'll have all the other trick-or-treaters in awe!
NOTE: If making fake blood is a bit too spooky for your little scientist, check out our Bubbling Brews Experiment!
NOTE: though this recipe is safe, edible, and can be cleaned up with soapy water, it may stain, so choose clothes that can get messy!
What's going on?
What makes this fluid different than just using colored water?
All liquids flow, but some flow faster than others. Viscosity is the property of a liquid that describes how fast or slow it will flow. Usually, the thicker the liquid, the more viscous it is and the slower it flows.
Water is NOT very viscous - it flows very well. Think about pouring water out of a bottle - it comes out pretty fast, doesn't it?
Molasses, on the other hand, is much more viscous than water. Molasses flows very slowly - you might even have to use a spoon to get it out of the jar.
Blood has a viscosity in between water and molasses; it's not as viscous as molasses, but it's about four times more viscous than water. In addition to water, blood is made up of cells and proteins, which make it thicker and more viscous.
For our fake blood recipe, we started with water. To make it thicker, we added powdered sugar and cocoa to imitate the viscosity of real blood. Did you notice that the mixture got thicker when you added the sugar? The cocoa powder also helped to thicken the mixture. In addition, the cocoa powder added a brownish color to make it look more like real blood - which is quite a bit darker than just bright red food coloring!
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For more exciting experiments, check out our Yellow Scope Science Kits on the Shop tab of our website!
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