how is the fake blood of the movies created? The specialists of the movies have tried to simulate the red color of the blood in the more true possible way, with results more o less successful. What is the secret recipe? The featuring red color of the blood is due to a protein which carry the oxygen, called hemoglobin. This protein is inside the red blood cells. The iron attaches to the oxygen to transport it over the body. This link changes the wavelength of light. The more oxygen the blood is brighter. The cinema specialists have attempted to simulate this coloration in the better possible way, with different results. The first fake blood was made in the theater 'Grand Guignol' of Paris. Its secret recipe was a mixture fifty-fifty of carmine , secreted by the insect called 'cochinilla', and glycerin, a viscous substance. Decades later, the corn syrup with colorant happened to use. The master of cinema makeup, Dick Smith, creator of the look of the girl in 'The exorcist' and designer of the look of 'Vito Corleone' in 'The Godfather', developed a recipe that revolutionized the terror cinema. Dick Smith added methylparabenos, an ingredient used in cosmetic that preserves the properties of the blood longer, and a photographic wetting agent that made the blood flow in a more uniform way.