| http://www.w3.org/ns/prov#value | - The result is a more uniform, smooth surface which reflects light in just a single direction, the luster turning quite flat and lifeless when the coin is turned obliquely to the light source.It takes a lot of comparison between cleaned and uncleaned coins for a beginner to learn this distinction, and some people just never quite get it no matter how many examples are presented for study.
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