Here are the four best "recipes," depending on the exact scary scene you have in mind.
How to Make Fake Blood for Halloween: 3 Creepy Ways
Washable Non-Staining Fake Blood: Make Your Own in 3 Steps
Halloween Makeup Fake blood makeup, Blood makeup, Halloween makeup easy
How to make fake blood - Fake Blood Recipe - Halloween Science
4 Easy Fake Blood Recipes - How to Make Fake Blood
How to make fake blood - Gathered
Recipe for Horror: How to Make Fake Blood Capsules for Halloween « The Secret Yumiverse :: WonderHowTo
Homemade Fake Blood —
3-Ingredient, Edible Fake Blood Recipe