Review on π Spooky Sleek: MaleDen Invisible Upgraded Message Halloween - Unleash Your Mysterious Side! by Jonathan Germain
Good Deal, Fun Pens
I actually bought these to create hidden areas on Dungeons & Dragons maps. Not exactly what they were intended for, but after creating the cards and then using them in game after about three to four weeks, the ink still appeared under the light. I find this to be a one of a kind item that can be used for many creative purposes and is very affordable. Highly recommended.
Pros
- Spy Pen: The ink becomes invisible after you write with it unless you turn on the black light on the cap to see the secret message clearly.
Cons
- Ugly Packaging
