What is dye pack?

A dye pack is a security device used by banks and other financial institutions to deter robberies. It is a small, explosive device that is included in a stack of bills or a cash drawer. If a robber demands money and takes the dyed bills, the dye pack will explode, releasing a bright, permanent dye onto the bills and the robber's hands and clothing. This makes the stolen money easily traceable and unusable, as it will be visibly stained.

Dye packs are typically used in conjunction with other security measures, such as security cameras, silent alarms, and bullet-resistant barriers, to make robbing a bank a high-risk endeavor. The goal of using dye packs is to protect employees and customers, as well as to help law enforcement track down and apprehend suspects.

Overall, the use of dye packs has been effective in reducing the number of bank robberies, as most criminals are deterred by the potential consequences of being caught with stained money.