00:00Roman intelligence operatives deployed iron gall ink to expose double agents.
00:05Chemical reactions transformed hidden iron traces into dark purple letters under acidic vapors.
00:12Common sense says search for hidden scrolls, but the secret letters vanish completely under normal daylight.
00:19Guards brush iron sulfate over oak gall liquid to instantly turn hidden sympathetic ink pitch black.
00:27Iron gall ink reacts with ferrous sulfate reagents exposing hidden treasonous correspondence written by Roman frontier double agents.
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