Secret Writing Sample
Description:
This is a photograph of the original letter, written in French; when exposed to certain chemicals, a secret message appeared. The Germans discovered the letter and were able to expose the secret message.
Institution:
Western Michigan University Libraries
Rights:
No Copyright - United States. Physical ownership of materials: Wilhelm Doegen. Kriegsgefangene Völker, Band I: Der Kriegsgefangenen Haltung und Schicksal in Deutschland. Berlin: Verlag für Politik und Wirtschaft, 1921, Photo 24, 76B.
Subject Topics:
Code,
Type:
text