DIMENSIONS: EVALUATION / Perspective
R E F E R E N C E S
Touchstone n. 1. a black silliceous stone used to test the purity of gold and silver by the color of the streak produced on it by rubbing it with either metal. 2. a test or criterion for the qualities of a thing.
[Urdang, Laurence, ed. Random House Dictionary of The English Language. New York: Random House, 1968.]
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