UV Pen with invisible ink
UV Pen with invisible ink
65 viewsDec 13, 2021
24kupi.com
Do you have a flashlight with UV? That’s ultraviolet—but what’s it good for? First thing: Every U.S. bill $5 and up has a security thread that glows under UV: $5 → Blue - $10 → Orange - $20 → Green - $50 → Yellow - $100 → Pink(ish) Useful for checking cash, not just… shady transactions. Hotel hygiene check – UV light makes urine glow yellow-green and s*m*n glow white-blue. It may even faintly reveal saliva and sweat. Blood detection – Unlike other fluids, blood absorbs UV, appearing dark or blac
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Do you have a flashlight with UV? That’s ultraviolet—but what’s it go…
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FacebookRob Benson
2 x 365nm 395nm Black Light UV Flashlight Mini Penlight Blacklight Ultraviolet Pen Flashlights for ID Check, Leak AC Detection, Stamps Resin Curing Pet Urine, Stain Handheld Detector
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2 x 365nm 395nm Black Light UV Flashlight Mini Penlight Blackligh…
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amazon
The magical ultraviolet detection pen can detect pesticide residues, determine the freshness of meat, and verify banknotes.
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The magical ultraviolet detection pen can detect pesticide residues…
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TikTokvqigosmgcco
The magical ultraviolet detection pen can detect pesticide residues, determine the freshness of meat, and verify banknotes.
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The magical ultraviolet detection pen can detect pesticide residues…
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TikTokvqigosmgcco
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