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<p>[QUOTE=&quot;Collect89, post: 1387293, member: 15445&quot;]<b>I don&#039;t know how they do it.</b></p><p><br /></p><p><br /></p><p><br /></p><p><br /></p><p>If you begin with a mirrored surface (like that of an inverse proof AE, then you could simply deposit a thin layer on the mirror to cause interference (like a thin oil film on water).&nbsp; <a href="http://www.answerbag.com/q_view/23544" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.answerbag.com/q_view/23544" rel="nofollow">http://www.answerbag.com/q_view/23544</a>&nbsp;&nbsp; I suspect that you would mask the field portions of the coin &amp; deposit a thin layer to the balance of the coin using a chemical process or a vapor deposition process.&nbsp; It may be that you don&#039;t even need to mask the field areas because they are non-reflective on the inverse proof coins.</p><p><br /></p><p>Alternately, you could replicate or adhesively place a diffraction pattern on the devices and cause a similar optical affect.[/QUOTE]</p><p><br /></p>

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