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I have just tried the test, and the horn scales I have give off a smell much more readily than the tortoiseshell when rubbed. The tortoiseshell gave off a very faint smell, similar to horn, which...

Sadly I don't think that any of them are real tortoiseshell.

Historically, they used to make a mixture of caustic soda (soap lye) and white lead mixed together with urine (!) and put it on the...