Difference between revisions of "Touchstone"
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== Description == | == Description == | ||
| − | A hard, black, fine-grain stone that is composed of [ | + | A hard, black, fine-grain stone that is composed of [[flint|flint]], Lydian stone, or [[basanite|basanite]]. Touchstone are used for evaluating the purity of [[gold|gold]] and [[silver|silver]]. The gold or silver piece is rubbed against the touchstone, then the color of the streak is compared to reference streaks of known composition in order to determine the quality of the precious metal. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
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basanite | basanite | ||
| − | == | + | ==Resources and Citations== |
* Henry Hodges, ''Artifacts: An Introduction to Early Materials and Technology'', Ronald P. Frye, Kingston, Canada, 1988 | * Henry Hodges, ''Artifacts: An Introduction to Early Materials and Technology'', Ronald P. Frye, Kingston, Canada, 1988 | ||
| − | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "Touchstone." | + | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "Touchstone." Accessed 9 May 2004 . |
* Thomas Gregory, ''The Condensed Chemical Dictionary'', Reinhold Publishing, New York, 3rd ed., 1942 | * Thomas Gregory, ''The Condensed Chemical Dictionary'', Reinhold Publishing, New York, 3rd ed., 1942 | ||
Latest revision as of 10:54, 11 June 2022
Description
A hard, black, fine-grain stone that is composed of Flint, Lydian stone, or Basanite. Touchstone are used for evaluating the purity of Gold and Silver. The gold or silver piece is rubbed against the touchstone, then the color of the streak is compared to reference streaks of known composition in order to determine the quality of the precious metal.
Synonyms and Related Terms
basanite
Resources and Citations
- Henry Hodges, Artifacts: An Introduction to Early Materials and Technology, Ronald P. Frye, Kingston, Canada, 1988
- Encyclopedia Britannica, http://www.britannica.com Comment: "Touchstone." Accessed 9 May 2004 .
- Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 334
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
- George Savage, Art and Antique Restorer's Handbook, Rockliff Publishing Corp, London, 1954