For a magic-like effect where a "cut" appears instantly on the skin:
Creating realistic "Blood HD" (high-definition fake blood) depends on whether you need it to be edible (for mouth work) or washable (for costumes). Here is how to prepare professional-quality fake blood using common ingredients: 1. Edible "Cinema" Blood BloodHD
: Add Red Food Dye gradually. Use a tiny drop of Blue or Green Dye to deepen the red into a more realistic, darker venous color. For a magic-like effect where a "cut" appears
Use this if you are applying blood to fabrics and want to minimize permanent staining. Use a tiny drop of Blue or Green
Watch these demonstrations to master the texture and color of your fake blood: How to Make Fake Blood YouTube · Denver Center for the Performing Arts
: When the knife touches the skin, a chemical reaction creates Iron(III) Thiocyanate , which is a deep, blood-red color.