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<p>[QUOTE=&quot;BAJJERFAN, post: 2130281, member: 74330&quot;]A number of years ago the spotting on a NGC slabbed ASE was examined using a technique called ESCA&nbsp; Electron Spectroscopy Chemical Analysis aka XPS x-ray photoelecton spectroscopy. The only element found other than silver was chlorine leading to the conclusion that the milk spots are composed of silver chloride. The most likely source of the chloride is from hydrochloric acid possibly used as a cleaning agent during the planchet preparation process.&nbsp; I was at one time in contact with the head quality control person for the mint and she had confirmed that it was most likely silver chloride too. Unfortunately she has moved on from that duty.[/QUOTE]</p><p><br /></p>

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