Test your courage by using our Test Tube Fake Blood! Test Tube Fake Blood is fake blood that can be applied to skin or clothing to give a horrific, blood stained effect. Use this fake blood to add realism to simulated cuts, wounds or bites! Test Tube Fake Blood is a water based red liquid that should not come in contact with eye, ears, nose or mouth. Test Tube Fake Blood may stain certain materials - use with caution.