Escape maps were made of silk because it was more durable than paper, you could fold it in your pocket, and it didn't make a noise when you unfolded it.
If you have not read Leo Marks' Between Silk and Cyanide (1998), you are perhaps the person I know who most needs to, stat.
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If you have not read Leo Marks' Between Silk and Cyanide (1998), you are perhaps the person I know who most needs to, stat.