![]() ![]() We found a difference in electrode potential between the two metals (the yellow metal was more negative and the white more positive) that was dependent on time and on the electrical resistance of the connector. ![]() As 1- and 2-euro coins are bimetallic, we measured the galvanic potential between the two metals with a high-impedance voltmeter after mechanically separating the pill and ring of a freshly minted coin and immersing them in either artificial sweat or saturated NaCl solution. In the 1-euro coin, the ring is made of a yellow alloy ('nickel brass') that consists of copper with 20% zinc and 5% nickel by weight the white ('cupro-nickel') pill is copper with 25% nickel by weight in the 2-euro coin the ring is cupro-nickel and the pill is nickel brass.
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