Testing Stone

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Use this black stone to test silver and the karat value of gold pieces. Rub the test needle and the test article on the touchstone, then apply test solutions to determine the karat value.

  • Dimensions : 4"W x 1-1/2"D x 3/8"H
  • Country of origin : India

Catalog page: 2020-2021 Tools and Equipment Catalog p. 265