valve action uv visible paint marker

Markal Valve Action Paint Marker Ultraviolet

Visible under UV light, the Valve Action marker leaves an invisible paint mark that glows a vibrant blue under ultraviolet light or black light, making it ideal for areas where security, quality control, tamper protection or counterfeiting are important. The permanently invisible paint dries quickly and ensures long-lasting, weather-resistant and abrasion-resistant markings.