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Can lime juice produce the same effect?
Or just lemons?
How to make invisible ink (and view it too)
Handheld Ultraviolet Black Light with UV LEDs and a PVC tube
Things That Will Glow In Black(UV) Light
Phone Light to UV Light Hack!! (Works with other lights too!!)
Make STEM Fun With UV LEDs
25-Cent Invisible Ink/Pen (UV light visible)
Invisible Printer Ink
How To Make Invisible Ink
The Pencil Guy
Ultraviolet Business Card Flashlight
Posted:Feb 14, 2009
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