Dykem Medium Tip UV Marker Clear, 12 per box | ITW Professional Brands

They Dykem Ultra Violet Marker goes on invisible but illuminates blue under a black light. The fiber tip writes on virtually any nonporous surface including plastic, glass, metal and more Great for Quality Control processes, tamper checks, tagging, ownership, anti-counterfeiting and much more Marks are invisible but illuminate / fluorescence blue under UV light aka black light Marks can be seen by most UV luminescence sensors Heavy duty aluminum body with large paint capacity Bullet tips are replaceable to assure complete use of paint in each marker Applications: Valve action mechanism prevents paint in barrel from drying when the cap is left off Safe on most surfaces. Surface tests should be run to determine compatibility prior to use. Depress tip to start flow Replace cap when not in use Removable with DYKEM Remover & Cleaner Light absorption = 375 nm; Light fluorescent = 435 nm