The History and Mathematics of Codes and Code Breaking

Episode 16 – Invisible Ink

by Kolapo Dairo

In this episode of One-Time Pod, we dive into the history of invisible ink. Dating back to over 2,000 years ago, invisible inks have been used for secret correspondences and espionage during wars. In this episode, we explore the types of invisible inks, how it’s used, and its role in history. Overall we learn about the practical applications of invisible ink, and its significance in secret communication.

Audio Sources:

Content Sources:

Image: Still from National Treasure (2004)



Episode 15 – The Somerton Man


Episode 17 – The Fanqie Code


  1. Oluyinka Adediji

    Thank you for this project

  2. Oluyinka Adediji

    Thanks for this project . Highly informative and well presented.

  3. John Adeniyi

    Excellent work

  4. Charles

    The mystery and dimensions of the invisible ink.

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