Home Self Defense: UV Fluorescent Crayon
Fluorescent UV Crayon is Water Resistant
Invisibly mark articles such as currency, tires, paper, wood, metal, glass, etc. for identification and theft detection purposes. These fluorescent wax crayons are practically invisible on most backgrounds, but highly fluorescent when exposed to a UV lamp of any wavelength.
These are big crayons, 5.5 inches long and 1/2 inch in diameter.
Mark valuables to identify if stolen. Being wax-based it doesn't come off so easily and is water resistant. Available in light green for currency marking, dark-colored and green-colored surfaces. Viewing fluorescent marks in a darkened environment makes the fluorescence easier to see. Always test a surface with your uv source. Many fabrics for example, will fluoresce naturally making the markings hard to see. You may have to use a liquid UV ink on fabrics. These crayons are most visible if applied to a non-white surface.
The $20 bill example shows a marked bill in plain light and with UV light. The marks on the bill are just a single slash with the green crayon that fluoresces blue. Click on the picture to enlarge.
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