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<p>[QUOTE=&quot;GDJMSP, post: 3280796, member: 112&quot;]That&#039;s part of it, but is also the metal itself, and thus the luster, in the protected areas and device edges being different from that of the fields and large central devices.</p><p><br /></p><p>In effect the same principle is involved that allows one to make the date on Buff, where the date has been worn away, visible once again by using acid. The metal in the protected areas and devices edges is harder because it has been worked more, stressed more than the metal is more open areas. This increased hardness makes the luster there different and thus it tones differently, and often not as readily.[/QUOTE]</p><p><br /></p>

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