Duplex reference specimen
An alternative and very sensitive test is by means of an alloy with two major copper/zinc phases separated by an atomic number difference of 0.1.
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An alternative and very sensitive test is by means of an alloy with two major copper/zinc phases separated by an atomic number difference of 0.1. The light phase illustrated in the micrograph has a mean atomic number of 29.47 and the dark phase a mean atomic number of 29.37.
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