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<p>[QUOTE=&quot;jjack, post: 1634741, member: 33596&quot;]Milk spots may not be caused by humidity as mentioned earlier, Mints&#039; claim it is due to this taken from wiki article. Humidity might accelerate this process</p><p>&quot;A very common trait that many Canadian Silver Maple Leaf&#039;s carry, is the&nbsp; well known &quot;Milk Spot.&quot; It is a baked-in blemish, that has a cloudy&nbsp; white appearance to it. This happens when a cleaning detergent is left&nbsp; on the coin, and is still present when the coin goes into a furnace to&nbsp; prevent it from being brittle,and it gets baked into the coin itself&quot;</p><p><br /></p><p>As for Red spot in Gold they are manufacturing defect and are due to impurities left behind, even 999s gold bullions&#039; have them. Humidity has nothing to do with this, gold is an inert metal. Most modern gold coins rarely have any red spots.[/QUOTE]</p><p><br /></p>

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