The ink is invisible after you write with it,Turn on the purple light on the lid to illuminate the writing area so you can see the secret message
The ink is invisible after you write with it,Turn on the purple light on the lid to illuminate the writing area so you can see the secret message
UAKZMNE Invisible Ink Pen, 10 PCS Invisible Ink Pens with UV Light for kids, Spy Pen Magic Marker Kid Pens For Secret Message, Kids Halloween Goodies
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The ink is invisible after you write with it,Turn on the purple light on the lid to illuminate the writing area so you can see the secret message
UAKZMNE Invisible Ink Pen, 10 PCS Invisible Ink Pens with UV Light for kids, Spy Pen Magic Marker Kid Pens For Secret Message, Kids Halloween Goodies