Sirchie Invisible Fluorescent Crayon, Pale Yellow, Fluoresces Bright Yellow

The Sirchie Invisible Fluorescent Crayon (Pale Yellow, Fluoresces Bright Yellow) may be used effectively to mark currency, paper and cardboard products, clothing, plastic products and other porous or non-porous materials for tagging and tracing purposes. Markings are highly fluorescent when exposed to longwave (UV) or shortwave (UV) radiation.