Regular ketchup combined with other ingredients makes realistic-looking blood.
Ketchup alone does not make very realistic-looking blood. Ketchup is too red and too thick to look authentic. In a pinch, ketchup alone can give someone a fright, especially in unexpected ways, such as to simulate getting cut with a kitchen knife. For maximum effect, however, use ketchup combined with other ingredients to make the blood look realistic. There is a basic formula for ketchup blood, but you will need to modify the recipe based on the use for the blood. Add water to make the blood runnier and use more syrup for a more congealed look.
Instructions
1. Mix about 1/2 cup of ketchup and 1/2 cup of corn syrup in a blender. Blend the two materials together on low until the two ingredients are thoroughly mixed.
2. Add about 1 tbsp. of cocoa powder to the mixture to add the rust color often associated with blood. Mix on low for about a minute to mix all ingredients.
3. Test the thickness of the blood with a large spoon. Dip the spoon into the blood mixture. The blood should run off the spoon quickly, but have a slightly sticky appearance. If necessary, add about 1/4 cup of water to the mixture to make it less sticky.
4. Store the blood in the refrigerator for up to one week. Allow the blood to warm to room temperature before using. Stir with a spoon to remix the ingredients if they have separated while in the refrigerator.
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