Cation-ratio dating

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cation-ratio dating: this method aspires to the direct dating of rock carvings and engravings, and is also potentially applicable to Paleolithic artifacts with a strong patina caused by exposure to desert dust. It depends on the principle that cations of certain elements are more soluble than others; they leach out of rock varnish more rapidly than the less soluble elements, and their concentration decreases with time.

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