Exchange confidential messages with your fellow agent using disappearing and reappearing ink that only the two of you can read! Using either of the two secret pens, you can write a message that, once dry, becomes invisible. The other pen will not only reveal the information, but you can also use it to send your reply.
- Use the special invisible ink pens to write top secret messages
- One pen writes in invisible ink, second pen makes the writing visible
- Includes tips and tricks for writing other secret communications
- Packed in durable metal tin