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<p>[QUOTE=&quot;desertgem, post: 2714209, member: 15199&quot;]Non metallic atoms can form bounds with the metal atoms, this is how you get copper sulfide, chlorides, etc forming on the surfaces. If they are in the melt mix originally, they can bond also, but as with the surface the bonding is not &quot;metallic bonding&quot; these would be visible ( with some high magnification devices ) as little island in the sea of metallic electrons or on the surface ( maybe the famous &#039;gold red spots&#039;). Non-metallic bounding has very little ductility. Try to flatten copper-sulfide like metallic copper , gold , or silver.</p><p><br /></p><p>&nbsp;&nbsp; &nbsp; We have all seen coins with fiber hair, or other non-metallic material pressed into the srface of a metallic coin, and it stays there, but it is not chemically bonded with the metal, Just held.&nbsp; In the 1500 the Japanese metal workers made copper-silver layered metal objects ( Mukume Gane) which were fused together by careful control of kiln temperature so that the surface of the layers bonded with the diffusion of each into the other. Coming back into jewelry today by the way, Contamination of the surface of the layers would destroy the objects ability to bond. Hope this rambling helps <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><a href="https://en.wikipedia.org/wiki/Mokume-gane" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Mokume-gane" rel="nofollow">https://en.wikipedia.org/wiki/Mokume-gane</a>[/QUOTE]</p><p><br /></p>

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