This ultraviolet marker can write invisibly on almost any dry surface, including metal, paper, glass, paint, skin, and currency.
The markings remain invisible until illuminated under an ultraviolet light source (see our Ultraviolet LED Flashlight for a light source).
Ideal for marking personal property, sensitive notes, thief detection, and covert communications.
The ink is heat-proof, waterproof, and non-toxic.
Available in 3 ink colors: blue, red, and lime green.
The blue and red inks are oil-based; the green ink is water-based.