UV Flash Pen
A UV flash pen reveals invisible ink messages for spy‑themed parties. This flash pen emits ultraviolet light at 395 nanometers. The UV flash pen makes fluorescent colors glow brightly. Crafters use a UV flash pen to cure certain resins and glues. The focused beam of a flash pen hardens small drops of UV adhesive. A flash pen with a blacklight mode detects security watermarks on documents. For...
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