An intelligent banknote neutralisation system (IBNS) is a security system that is used by banks, ATMs, retail establishments, vending machines and the cash-in-transit industry, to render stolen funds unusable and easily identifiable. Dye packs are inserted between bills in random bundles. If a bundle containing a dye pack is removed from a specified area, it explodes, releasing an indelible dye and possible array of additional chemicals. The conspicuous, brightly colored stains on the bills allow quick, easy visual recognition of stolen money. Tracers and markers can also be added to the ink or bonding agent providing forensic evidence linking the criminal to the crime. Bonding agents (glues) have been used more recently.