Joke knife with disappearing blade and dye container - has acoustic generator producing special effects in conjunction appearance of blood during simulated stab

摘要

The blade is pushed back against the pressure of a spring into a recess in the handle which contains a plastics reservoir of coloured liq., dispensed by rollers or brushes on to the blade while it is retracted. A microprocessor-controlled acoustic generator is activated through a switch or key, either by hand or by pressure on the point of the blade. USE/ADVANTAGE - As practical joke or theartrical property. Damage to skin or clothes is avoided by use of opaque, highly viscous and non-wetting liq. instead of real dye.