Amazon: 16 Pack Invisible Ink Pens Just $10.94 (Fun For Goody Bags)
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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.
Get free shipping on a $25 order OR snag free 2-day shipping on ANY size order with Amazon Prime (you can sign up for a FREE 30-day trial here). OR, choose free no-rush shipping and get a $5.99 credit for Prime Pantry OR a $1 credit for eBooks & more – may vary by user.