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One method is to take one thread sample from the map and burn it. Rayon will melt but silk will burn.

Most "silk" maps made in WW2 were actually rayon. A few of the early maps were silk and these were usually crude maps and not in color. In 1943 the British also began using viscose rayon and cuprammonuium, a form of rayon commonly known asBemberg silk or copper rayon.

The following site identifies most of the escape maps used by the Americans and many of those used by the British.

http://www.escape-maps.com/

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