Applied by the owner, the solution is invisible to the naked eye but glows yellow under ultra-violet light.

TRACER is a registered Smart Water product that can be invisibly and permanently applied to a whole range of goods or materials. If any goods are stolen and recovered the fluorescent markers will allow the location of the marker to be found and the owner identified from the FSS register. It is particularly effective in the marking of cloth and complex components such as printed circuits boards where removal or obscuration would be difficult.