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<p>[QUOTE=&quot;cladking, post: 1303684, member: 68&quot;]It&#039;s mostly just experience.</p><p><br /></p><p>From very early on it was obvious that what mints do and what they say don&#039;t really match.&nbsp; In most cases it&#039;s not intentional misdirection as it is that their terminology is different and their right hand doesn&#039;t know what the left is doing.&nbsp; If they say their packaging is stable it just means the coins won&#039;t go bad in shipment (usually). If they say mint set coins are made just like other coins they just mean that they are struck once by a pair of dies.&nbsp; In actuality these coins have been completely different since 1965.&nbsp; </p><p><br /></p><p>If you look at a bunch of mint sets you&#039;ll occasionally find one that was subjected to a very harsh chemical enviroment.&nbsp; Moth balls can cause this too but it&#039;s usually an acidic cause I believe.&nbsp; The four layers of plastic will separate and the inner two will burn green on a pin.&nbsp; If the temperature is kept steady and the humidity fairly low this process is slower.&nbsp; I believe that storing the sets on their sides or under pressure accelerates it.&nbsp; </p><p><br /></p><p>The Canadian packaging seems a little better generally.[/QUOTE]</p><p><br /></p>

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