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<p>[QUOTE=&quot;desertgem, post: 7602612, member: 15199&quot;]We have been through this before about hardness. If cotton didn&#039;t have a hardness&nbsp; value, you couldn&#039;t use cotton gloves or even keep your cotton or other fiber based clothing from lasting only a short time. but plant fibers are different&nbsp; from metals/minerals. Moh&#039;s hardness scale based many years ago, is what we normally use to describe hardness, but it was intended for mainly minerals with Gold and silver being about Moh 2.5,&nbsp; copper being about 3.0.&nbsp; You have to look a long time in references ( even with google) to find a comparison with plant or synthetic fibers. The one I found then extrapolated it to the range of 5 , and cotton has a specific hardness scale for the range of hardness of the fiber as different varieties of cotton have different feel in texture for manufacturing. So yes it can scratch soft metals. An iron/steel coin should not be a problem.&nbsp; IMO,&nbsp; Jim[/QUOTE]</p><p><br /></p>

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