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<p>[QUOTE=&quot;-jeffB, post: 2131063, member: 27832&quot;]Sure, those are white -- but silver nitrate will wash away instantly in water, and silver sulfite will dissolve in ammonia or decompose in acid. Since others have said that an ammonia rinse doesn&#039;t affect the spots, these seem unlikely.</p><p><br /></p><p>...Unless, of course, they&#039;ve actively and visibly <i>etched</i> the surface, and that texture remains after they&#039;re gone. <i>That&#039;s</i> where we need the SEM imagery, I&#039;d think; scan spotted and unspotted surface regions before and after treatment, and see how each has changed.</p><p><br /></p><p>Now I <i>really</i> wish my friend still worked at the materials lab...[/QUOTE]</p><p><br /></p>

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