When you think someone might be stealing or tampering you can use this Thief-Detection Powder to catch them “red-handed”, so to speak. Use our Feather Duster to lightly apply the Theft Detection Powder to objects you think the person might touch or take. Later, you can check their hands with a UV-light source and if they touched that object and got the powder on their hands, it will fluoresce. This powder is not meant to “stain” and therefore, must be evaluated with a light source fairly soon after touching. 1 oz