Patent ID: 8171865

Claim:
A method of defacing or destroying items stored on a drum ( 2 ) in an alarm-equipped value space ( 30 ) using a pierceable or openable container ( 80 ) that contains a defacing agent or a destructive agent (C), movable means for piercing or opening the container ( 80 ), characterized by distributing the defacing agent or the destructive agent (C) into the value space ( 30 ), where the value space ( 30 ) is conforming generally to an exterior shape of the drum ( 2 ), in response to triggering of said alarm by piercing or opening the container and reducing the volume of the container ( 80 ) by compressing the container into a substantially flattened configuration having substantially no volume for accommodating fluid with a compressing element; and by preventing return of the defacing agent or the destructive agent (C) into the container ( 80 ) after substantially all of the defacing agent or the destructive agent has been discharged from the container by blocking a passageway between the interior the container and the value space by the flattened container and the compressing element which acts as a seal.