_spies-and-secrets-alum-invisible-ink-1600s-uh0036.jpg "Spies and secrets: Alum Invisible Ink (1600s) (UH0036) from letter headed paper Video Screenshot Preview")
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⏲ Duration: 4 min 38 sec
✓ Published: 29-Oct-2016
✓ Published: 29-Oct-2016
Description:
By her correspondent’s panic reaction at having lost her letter with the formula for “invisable [sic] ink,
By her correspondent’s panic reaction at having lost her letter with the formula for “invisable [sic] ink,
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