Spy Pen:The ink is invisible after you write with it,unless you light on the cap blacklight to see the secret message perfectly.
Hide the Secret Message You Write: This magical invisible ink pen allows you to write down your secret information and hide it,Once Write down your
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Spy Gadgets – Page 2 – ToysCentral - Europe
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SyPens Inspire creativity and imaginative adventure, as well as encourage literacy skills with the Spy Pen for Kids set. A built-in UV light in the caps reveals the secret message seconds after it's written. Add these invisible ink pens for kids to party favor bags, add them to a literature lesson when covering the adventure genre. Children will adore writing pen pals with these disappearing ink pens.
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