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Touchstone (assaying tool)

This article is about the assaying tool. For the metaphor, see Touchstone (metaphor). For other uses, see Touchstone (disambiguation).
Touchstone set

A touchstone is a small tablet of dark stone such as slate or lydite, used for assaying precious metal alloys. It has a finely grained surface on which soft metals leave a visible trace.[1]

  1. ^ "Touchstone". Oxford English Dictionary. Retrieved 10 March 2013.

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