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Become a secret agent with professional-grade invisible ink technology. Write hidden messages with one pen, reveal them with the other—perfect for covert communication with fellow operatives. Your messages vanish when dry, staying invisible until the reveal pen brings them back into view. Switch roles instantly: use either pen to write or uncover secrets. Includes insider tips for advanced coded communications. Everything arrives in a sleek metal tin built to withstand field operations. From Thames & Kosmos, for ages 8 and up
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