Fluorescent Marking Pen
This is an all purpose felt tipped pen that may be used to mark just about anything with an invisible, permanent mark for identification or tracking. Permanently marks porous materials such as paper, currency, cloth, and wood. Markings can be removed from non-porous objects such as glass, metal or plastics. Fluoresces a brilliant blue/white under UV radiation.
Arrowhead Forensics, Inc.