Dr Helen Fry | WWII Historian @DrHelenFry · 06 Jun 2026
As a bonus for making it this far in the thread, I wanted to show you something special: Secret agents really did use invisible ink to relay secret messages! Attached is an invisible ink message from Agent Bronx (revealed in white writing). (continued...ending) https://t.co/wVPkPF4lzL
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