As a costume and accessories company, we are often being asked to supply a Bleeding Knife where a trickle of blood appears as you draw the knife over an exposed part of the body. Although the effect can be dramatic the blood is fake theatrical blood and no-one gets hurt!
Increasing film companies and theatre groups are using these as props so we thought we'd share the trick with you all so that you can scare your friends with this highly effective but cheap to assemble Bleeding Knife. This is especially useful for Halloween.
Gory Halloween Decorations
Long time the staple of stage magicians and fans of gorefests everywhere, the bleeding knife is either a great trick or scary illusion.
For the bleeding knife you will need a blunt plastic costume accessory knife; a thin strip of foam, glue or double sided adhesive, and some theatrical blood fluid - not gel blood.
Ensure that any rough edges or seams on the edge of the blade are removed so that there is no risk of injury when dragging it across the arm. Lightly glue some thin sponge onto the reverse side of the knife (that side that will be away from the viewer's line of sight, camera or audience) the sponge strip should be located just above the edge of the knife. When the glue on the sponge is dry it can be loaded with liquid blood (not blood gel).
To work the illusion, lightly apply the knife at a shallow angle so that there is a slight pressure created on the sponge forcing some the blood fluid from the foam creating the classic dripping blood effect. As with everything, some practice will be required to achieve the right angle and the pressure required to get the right amount of bleeding etc. Lastly, to complete the illusion, make sure that the knife is removed without the sponge side being visible.
Safety First
As with all illusions involving blood fluid and anything that looks like a sharp implement, great care should be taken when performing this illusion and it is not recommended for children under the age of 16 years.
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