The pen writes invisible ink that becomes visible when the cap is turned on and the light is on. The ink is harmless and odorless, making it a great toy for kids. The ink is permanent and washable, making it perfect for use on paper, cloth, walls, and even skin! Birthday Gifts, Halloween Gifts, Valentines Day Gifts or classroom activity, Christmas Presents, birthday for kids and friends. It is perfect for surprise party favor bags for kids!
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