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BIBLIOGRAPHY

Wikipedia, "Touchstone (assaying tool)" and Japanese edition, "Shikinseki".

Wikipedia (according to the sources of each article)

Claims Supported by This Source

  1. A metal is rubbed against a black stone, such as slate, and the color of the streak is compared with samples of known purity.
  2. Used since the Harappan period and also in ancient Greece.
  3. By extension, it means a standard for judging things (Japanese edition, "Shikinseki").

How to read the verification levels. 'Read' means the material was read in its entirety. 'Bibliography and abstract confirmed' means the bibliographic information and abstract were verified. 'Via course material' means the source was referenced through the main text of a book or a country's monetary history. The text hash is the SHA-256 of the main text from the original source page, excluding tags and whitespace, used to detect if the material has been altered.