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[Write your secret message] Once you use this invisible ink pen to write your secret message, you only need to wait a few seconds and use the light on

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✓ HIDE THE SECRET MESSAGE YOU WRITE: Unlock the world of secret messaging with this spy pens for kids invisible ink. Write, wait, and reveal hidden

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Invisible Ink Pen 28Pcs Latest 2023 Spy Pen with UV Black Light Magic Spy Marker Kid Pens for Secret Message and Birthday Party,Writing Secret Message