In this episode, we talk about Invisible Inks, an important concealment method, with Codemaster Cole, Al, and Dan. Invisible Inks are everywhere. You've almost certainly heard of them, or at least heard of secret ink or security ink, which is the same thing. There are so many that it is hard to know which ones to use, which is why we cover that in this episode. Plus, we talk about decoy letters, chemical reactions, Pliny the Elder, and introduce a shady character in the story.

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Links:
https://en.wikipedia.org/wiki/Invisible_ink
https://kids.nationalgeographic.com/explorer-academy/article/invisible-ink

The Background music used in this episode is "Bio Unit", "Energy Drink", "Generator", "Pulse", "4 AM", "Disco Tokyo", and "Airflow", all by Bio Unit, and our theme music is "Mosquito" by Caspar Babypants.

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Here's the Amazon link to Top Secret.
The Music used was Step by Bio Unit.