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<p>[QUOTE=&quot;iPen, post: 2351189, member: 69760&quot;]So basically the metal stretches in the direction dictated by the coining press process, creating peaks and valleys or &quot;mountains&quot;, which causes light to bounce off in a way to create a cartwheel luster effect.</p><p><br /></p><p>And, a super enlarged, analogous example would be how some coins&#039; designs with sun&#039;s rays create a cartwheel luster-like effect, right? Even wider separation (up to a certain point) of rays would still cause a cartwheel luster effect. This reminds of one such example as the 1924 Russian 1 Rouble coin below. There&#039;s absolutely no cartwheel luster remaining on the entire coin itself, yet the sun&#039;s rays cause a cartwheel luster to appear only in the area of the rays. If the sun&#039;s rays are stripped off, damaged, cleaned, what have you, then the cartwheel luster effect will disappear. Similarly, if coins are improperly cleaned or experience other types of damage, then these peaks and valleys become flattened or evened out. This is what goes on with fresh business strike coins, but on a much smaller scale, right?</p><p><br /></p><p><img src="http://i1228.photobucket.com/albums/ee451/kovacs22/P1070631_zpszoi8pdjt.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />[/QUOTE]</p><p><br /></p>

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