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<p>[QUOTE=&quot;NSP, post: 3128117, member: 74849&quot;]I’m majoring in Corrosion Engineering, and when I started four years ago, I thought I’d be able to have a better understanding of toning on coins. If there’s one thing I’ve realized about the wonderful world of corrosion, it’s that nothing is typical and there are always exceptions (but isn’t it that way with anything scientific?). </p><p><br /></p><p>Under “normal conditions” (standard temperature and pressure, relatively low concentrations of reactants, etc.), the passive silver sulfide film should prevent most subsequent corrosion from occurring unless the electrochemical potential becomes high enough for pitting to begin. Evidently in environments with very high sulfur content and high temperature, the passive film gets massacred. Evidently there is some other corrosion mechanism that comes into play at higher temperatures. I guess I’ll learn more about this in my high temperature corrosion class next semester. </p><p><br /></p><p>Out of curiosity, did you use pure sulfur to do this or some other sulfur-containing compound?[/QUOTE]</p><p><br /></p>

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