The invention relates to a gun protecting users against burglars, rapists and criminals. It bears the following parts: the trigger mechanism, the firing pin, the mechanism of the capsule containing dye penetrant-type liquid paint and the compressed air bottle 4. The handling of the gun is achieved as follows: upon push of the trigger, the firing pin pierces the bottle 4 wherefrom the compressed air is drawn to the mechanism of the capsule 2 and pushes the piston 3 of this last, while the sharp hollow plunger of the piston 3 pierces the membrane 14 of the capsule so that the liquid paint is impetuously launched at the target.
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