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<p>[QUOTE=&quot;BAJJERFAN, post: 2132298, member: 74330&quot;]Kinda cloudy n gloomy here, but we do need the rain. Otherwise it is a fine day. Regardless of what the spot material is, it is not added after the coin is struck so by default it must be on the planchet before it is struck. Whether the strike pressure contributes to its permanancy would, it seems, depend upon what it is. In the above video the milk spots are stated to be borax and except for the cloudy ammonia method which wasn&#039;t shown, appear to be easily removable. From what I have heard even the silver chloride based milk spots are easier to remove from proof coins than they are from business strike coins,which would lead one to believe that strike pressure is not a significant factor in the appearance of spotting. In the case of borax based spots a physical attraction is involved whereas for chloride based spots it&#039;s more likely the result of a chemical [often delayed] transformation.</p><p><br /></p><p>Tom[/QUOTE]</p><p><br /></p>

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