Note: Recently passed the use-by date but guaranteed to work
ToTaL IR™ is a non-toxic, infrared (IR) powder in brown or concrete color which can detect intrusion into restricted areas, and shows the direction traveled. After mixing two powders, an immediate and powerful infrared emission occurs for three to seven days, depending on the environment.
ToTaL IR™ can be used to tag shoes, tires, clothes, money, weapons, contraband etc., allowing intelligence-gathering. The powder is only visible with night vision equipment, however.