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<p>[QUOTE=&quot;KSW, post: 800998, member: 8708&quot;]Ok, so using my very *professional* Mohs testing I can tell you that</p><p>- a fingernail or wooden toothpick- no mark at all.</p><p>- the corner of a copper plate (see previous thread about photographic plates<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie51" alt=":hilarious:" unselectable="on" unselectable="on" />) made a small copper coloured mark but didn’t really go below the surface.</p><p>- stainless steel skewer made a proper scratch. </p><p>Does that help?[/QUOTE]</p><p><br /></p>

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