Steganography
A letter shown under UV light reveals a hidden message; historic image
Picture No
10799811
Media ID
47601216
Size
3694px x 2992px
(4.1MB)
Credit
©Photo Researchers / Mary Evans Picture Library
Source
Photo Researchers
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Restrictions Only for Ireland and United Kingdom
Analysis Analyze Espionage Evidence Forensic Forensics Handwriting Hidden Hide Invisible Ultra Ultra-violet Ultraviolet Violet Write
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