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<p>[QUOTE=&quot;desertgem, post: 2129821, member: 15199&quot;]That is farther down the chain, I need to determine if there are early indicators that ammonium compounds are even produced by the newer annealing ovens ( i.e., present in the other mints, and ammonia being produced), or I need a different suspect.</p><p><br /></p><p><br /></p><p><br /></p><p><br /></p><p>I have not seen extreme photographs of the coin surface of a &#039;milk spot&#039;, with a SEM or similar. If you have a link, I would like to see them. I also notice d in some of the mint releases, pictures of the cross section devices they use to insure that the metal grains are even distributed, I would suspect that would eventually show up in a &#039;lucky&#039; slice. </p><p><br /></p><p><br /></p><p><br /></p><p>Actually a quote on this site about how they knew about it, and since it was a bullion coin, ( basically ~deal with it), made me think it wasn&#039;t just a wash solution makeup , as that could be changed out but an expensive, difficult to replace,&nbsp; etc, piece of equipment like new annealing ovens. The new ovens should reduce other problems in the process such as premature oxidation -thus changes of the planchet surfaces. I am doubtful that the mints build their own, so some manufacturer has a niche and not a lot of competition. </p><p><br /></p><p>Any information on the mint&#039;s ovens would be interesting. I have ASE coins from the first to 2015, about 150+, and no spots. Also some foreign bullion .999 or .9999, and no spots. Small sample number I know, but indicates more than one factor perhaps.</p><p><br /></p><p>Not saying the question as to origin can be solved, but maybe more isolation of the problem, but my suspicion is that it will remain, as to cause and activation on stored coins.[/QUOTE]</p><p><br /></p>

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