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<p>[QUOTE=&quot;Insider, post: 2711168, member: 24314&quot;]Over the years, I have seen this effect on nearly fifty coins of all the common coinage metals except for tin, platinum, or gold.</p><p><br /></p><p>Nickel coins seem to be the most common.&nbsp; Silver dollars and halves next.&nbsp; Finally cents, especially Large cents.</p><p><br /></p><p>The lines on steel are parallel and fine because of the hardness,&nbsp; The buffing wheels I saw were brass, steel, canvas, and leather.&nbsp; As one poster wrote, heat is probably a big factor in the type of wave generated on the surface as they come in all sizes.</p><p><br /></p><p>Off subject but interesting - Since I cannot recall for sure the terms used to describe the height and distance between <span style="color: #ff0000">wave ridges</span> (I&#039;m too lazy to look it up), perhaps [USER=1892]@SuperDave[/USER] or [USER=19250]@Paddy54[/USER] knows the technical terms and can enlighten us.[/QUOTE]</p><p><br /></p>

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