Spy Writer Pen Set

The "Spy Writer" and "Spy Developer" gives the user an inexpensive way to secure all written material without being seen by any unauthorized individuals. Secret messages, security codes, marked cash used for theft detection or marked retrievals, etc., can now be handled very easily. The set consists of a writing pen with invisible ink which changes to black when it is marked over with the "Spy Developer" highlight marker (included). The ink from the "Spy Writer" can be developed weeks after being written, gibing total control. The set has a long shelf life of over three years.

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