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Put a little spy science into your day. This pen writes in invisible ink. To see your secret writing, use the included battery powered LED blacklight and the invisible ink will glow. The ink contains special pigments that fluoresce when exposed to ultaviolet light but are invisible under normal light. Order 2 pens and write secret messages to a friend. The included blacklight can also be used to show blacklight reactive features found in new paper money and on most credit cards. For ages 7 and above.