Touchstone metals
The touchstone was used during the Harappa period of the Indus Valley civilization ca. 2600–1900 BC for testing the purity of soft metals. It was also used in Ancient Greece. The touchstone allowed anyone to easily and quickly determine the purity of a metal sample. This, in turn, led to the widespread adoption of gold as a standard of exchange. Although mixing gold with less expensive materials was common in coinage, using a touchstone one could easily dete… WebThe technique of touching has acceptable accuracy in most cases. Moreover, itis rapid and has the advantage of requiring only a very small amount of test alloy. It will undoubtedly …
Touchstone metals
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WebNov 18, 2024 · Country of origin: United Kingdom Location: London, England Status: Split-up Formed in: 1981 Genre: NWOBHM/Heavy Metal Themes: N/A Last label: … WebApr 3, 2014 · touchstone (n.) touchstone. (n.) late 15c., from touch (v.) in the Middle English sense "to test" (metal) + stone (n.). Fine-grained black quartz, used for testing the quality …
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