If you’ve got school-age ghosts and goblins in your home, you should know these basics of Halloween parties.
• Edible fake blood: Mix together light corn syrup with enough red food dye to get the color you want. Sprinkle in a little unsweetened cocoa powder to darken the mixture. Too thick? Thin with water. Too thin? Thicken with flour or cornstarch, mixed in slowly.
• Dry ice vapors: Handle dry ice with care as it can cause frostbite. To make a steaming cauldron of vapor, place the dry ice in a container and add water, which will make a foggy vapor arise. This works great outdoors on Halloween. (A bird bath works well outside as the container.) The liquid will bubble crazily initially, in addition to the smoke, but you’ll need to replenish it with more dry ice to keep it going.
If you want the vapor coming out of a pumpkin, place a tall container with dry ice inside a carved jack-o-lantern, then add some water to the dry ice.