- Pen and paper
- Scissors / crafting knife
- Tape (of any kind)
We return to Instructables once again, this time learning of a concealment pen from user “pastprimitive”. The device is speedy and effective: simply remove the head and ink assembly from a ballpoint pen, tape your hidden message around the inkwell, and reassemble. As pastprimitive points out, the recipient can reply to your message on the same piece of paper with the same pen. Handily, the pen also has a built-in self destruct function: snap it in half and the ink should empty all over your message. Full tutorial can be found here.
This article is part of our series on stealthy ways to secrete your secrets. For more in the series click here. And if you have an idea for a great everyday hiding spot, send it to us at firstname.lastname@example.org. We’ll feature the best on our website later in the series.