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<p>[QUOTE=&quot;nuMRmatist, post: 2177789, member: 33012&quot;]What&#039;s the chemical reaction that gives the Blue? (I had some INorganic Chem in college)..............</p><p><br /></p><p>edit:</p><p>Found this on the web:</p><p>For example, silver needs <a href="https://en.wikipedia.org/wiki/Hydrogen_sulfide" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Hydrogen_sulfide" rel="nofollow">hydrogen sulfide</a> to tarnish; it does not tarnish with only oxygen. It often appears as a dull, gray or black film or coating over metal. Tarnish is a surface phenomenon that is self-limiting, unlike <a href="https://en.wikipedia.org/wiki/Rust" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Rust" rel="nofollow">rust</a>. Only the top few layers of the metal react, and the layer of tarnish seals and protects the underlying layers from reacting.[/QUOTE]</p><p><br /></p>

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