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<p>[QUOTE=&quot;Leadfoot, post: 1560364, member: 2972&quot;]As I recall the reason for the coloration (which is dependent on the thickness of the silver sulfide layer) is called thin film interference.&nbsp; Here is a brief overview of the physics:</p><p><br /></p><p><a href="http://www.physicsclassroom.com/class/light/u12l1c.cfm" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.physicsclassroom.com/class/light/u12l1c.cfm" rel="nofollow">http://www.physicsclassroom.com/class/light/u12l1c.cfm</a></p><p><br /></p><p>It is only after the silver sulfide layer exceeds a certain thickness that it becomes black.[/QUOTE]</p><p><br /></p>

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