The UV-visible Valve Action makes an invisible paint mark that glows bright blue when viewed with a UV or black light, making it ideal for security, quality control, tamper-proofing, and anti-counterfeiting processes. The permanent invisible liquid paint dries quickly to provide long-lasting, weather- and wear-resistant marks.

• Makes clear, invisible marks that illuminate bright blue when viewed with an ultraviolet or black light
• Invisible paint formula is ideal for security, theft-prevention, and quality control
• Fast drying formula reduces smearing
• Dura-Nib medium bullet tip resists wear to provide long marking life
• Durable metal barrel and clip cap reduce breakage and stores easily in pocket
• Marking range: -50°F to 150°F (-46°C to 66°C)
• Made in U.S.A.