It's easy enough to buy this stuff in the tube. But if you want some of the really good faux blood, try emulating some of the Hollywood recipes.
One of the most famous comes from the 1979 classic The Evil Dead. Along with Lovecraftian horrors, the movie also brings plenty of blood. , relayed by the movie's lead, Bruce Campbell, in his autobiography If Chins Could Kill, calls for 6 pints of Karo syrup, 1 pint of dairy creamer, 3 pints of red food coloring, and a few drops of blue food coloring.
Whip the creamer until it takes on a paste-like consistency, then stir it slowly with the Karo syrup. Stir in the food coloring, and you'll have yourself some excellent fake blood. Just make sure you know the mess you're getting into: Campbell called the stuff "the inbred cousin of super glue" and said the only true solvents were "heat and time."
And as you'll see in the clip below, Campbell knows way too much about it first-hand.
Only in the world of horror could a makeup artist be as much of a star as an actor or director, and Tom Savini has parlayed his work in makeup into both acting and directing. The man responsible for the makeup of George Romero's Dawn of the Dead and Day of the Dead is well-known within the genre for his gruesome effects. As relayed in his book Grande Illusions, Savini does most of his effects—whether fake hand, fake wound or fake head—by first creating molds.
Masks and hands were made by casting the real deal in dental alginate (the same stuff used to create casts of your teeth, ) to create a mold. For the wounds the process was a little simpler: He sculpted the wounds into the bottom of a thin plastic photographic developer tray, creating contours resembling the shapes of the wounds and bite marks. Think of it like denting the bottom of a cake pan. Aluminum trays, as long as they're somewhat malleable, will work as well.
Savani filled the tray with dental alginate to create a negative mold of all the wounds. Then he sprayed foam latex onto the molds. He scraped off the excess latex and then baked the wounds to firmness. Then he applied them to the undead as needed.
The Walking Dead has brought the zombie apocalypse to primetime TV. To create the texture of not-so-freshly dead skin on the undead, makeup artists Greg Nicotero and Andy Schoneberg add lots of conditioner to the hair of their makeup victims. Then they stretch the skin of the makeup application area (cheek or forehead), apply liquid latex, quickly dry it with a hair dryer, and powder it.
Bumpier textures can be created by combining the latex with oatmeal and spreading it on the skin until it looks right. The skin is colored in with regular makeup to make a pallid complexion. Wounds are textured gelatin with applied liquid latex, though you can use the prefab Savini wounds if you'd like.
Please, do not go the Tom Savini route of using real pig intestines to make fake guts. Dan Martin, the special effects guru behind the recent Wolfman remake and The Human Centipede 2 has a much simpler and less disgusting solution. , he recommended laying out multiple layers of liquid latex on a flat surface, then taking a large amount of paper towels and rolling them into a sort of makeshift rope before dragging them carefully through the liquid latex, pulling away from the surface. After that, he said, soak them in some red liquid, and you'll have some really disgusting unreal guts to throw around.
Perhaps this gets a little specific. In David Cronenburg's Scanners, the most infamous scene is where a head explodes on screen. It's ... jarring.
The first step is to take a "life cast" of your intended head's face. This involves making a similar to that mentioned in the Wounds section. Alginate provides a layer protecting the subject from the plaster that then covers their face. You'll want nose holes from the get-go, of course, to make sure they can breath. After letting the plaster set, you can remove the mold.
To make the head, they used the entire cast to make a fake latex skin outer layer (similar to how you might make a mask, for those at home itching to make one.) A rudimentary plaster support ensured that they could maintain a basic shape, while the rest was filled with gelatin. The producers also put in a few random items they had around to increase the explosion effect. (Wax, "stringy stuff," hamburger scraps ...)
Now, the explosive discharge is up to you, and we will not advocate for anything illegal, or unsafe. So that part is on you. But. The producers of the film, to get the full effect, cleared the room of any bystanders then shot it with a shotgun from behind in such a way as to be off camera after trying other methods.
More safely, the interior could be cut open with a knife to have a "liquified head," have a fake skeleton and fake blood placed within for a gruesome effect, or just used for a good old fashioned beheading. A plaster cast to make organs and a little gelatin would go a long way toward a fake brain. Either carve the contours yourself or make a mold of an existing brain and use some milk or other thickener in the gelatin to make a more opaque brain.
Now you're set to make your own amateur horror movie, make the best haunted house on your block, or pull a mean spirited prank. Just be safe out there!