Concealment: Pocket, Slick
This dust looks innocuous but glows distinctively under ultraviolet light. It adheres to whatever it touches. Agents use this substance to trap thieves and trace people. For example, a bureau which suspected one of its employees of purloining files might falsely label some document "secret" and sprinkle it with this powder. Later, counterespionage agents would examine the hands of employees under a black light to see who touched the document. Alternatively, one can arrange for surveillance targets to touch this substance, and then use an ultraviolet light to find out what the suspect has touched. When spread on a section of ground, will adhere to the feet of anyone passing through the area.
Assume that a sprinkling of this powder marks all people who touch the contaminated object or document. These people then leave traces on other objects for 2d6 hours. Placed on shoes or tires, this dust marks a trail for up to 1,000 meters. Tracing dust remains on the skin for 1d6 days under normal conditions. However, thorough scrubbing can remove this powder.
GMs who intend to use tracing dust against PCs may wish to establish the party's hygiene habits well enough in advance to avoid arousing suspicion.