UV Powder. 

An invisible UV powder, supplied in a 30g container, which is ideal to connect a suspected thief to a crime. Once applied, the invisible powder will be transferred to the skin when contact with the item is made. The powder will then show up under a UV lamp.  Ideal for use on documents, bank notes etc. The powder is available in blue and red.  These colours are visible under UV light only, as the powder is almost white to the eye.  The powder is also available in red which lights up luminous red under UV light.