Run over to Amazon where you can grab these 16-Count Set of Invisible Ink Pens for just $10.94 (regularly $14.99) when you use promo code FKLJCFRV at checkout.
Complete with a 6-month warranty, this set comes with 4 purple , 4 blue, 4 yellow, and 4 pink pens which can be used to write secret messages that can only be seen when you shine the light from each pen cap over them.
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