US Patent 7281477 Security apparatus

A security device for transporting monies from a cash acceptance terminal to a bank or similar safe location includes a note tube and a pair of flexible bags containing dye. Cutters operated by explosive devices when an unauthorised attempt is made to break into the note tube pass down the sides of the bags and rip them open. There is provided spring loaded pressure plates which serve to compress the bags to cause the dye to be ejected effectively into the note tube to stain all the notes therein.