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<p>[QUOTE=&quot;robinjojo, post: 8194494, member: 110226&quot;]I think the bluish hue on some of the Athena silver coins is created by Naval Jelly.&nbsp; If this pink colored acid is left on a silver coin for several minutes, the silver has time to react to the acid phosphoric acid (25-30%) and acid sulfuric acid (1-3%), it will turn blue when the coin is washed, dried and exposed to air.&nbsp; Any silver cleaning solution will eliminate this toning, but then the coin&#039;s surface is being played around with.&nbsp; It is best to leave it as-is.&nbsp; With time the blue will darken to a somewhat more acceptable shade, along with the rest of the coin.</p><p><br /></p><p>The owl came from Athena with a definite blue tint, actually stronger than this photo from the seller depicts:</p><p><br /></p><p>[ATTACH=full]1435253[/ATTACH] </p><p><br /></p><p>Here it is after a brief cleaning with dilluted silver cleaning solution and distilled water.&nbsp; Most of the blue tint is gone, leaving a fairly uniform grey color.&nbsp; Again, with time the coin naturally darken, maybe not in my lifetime, but it will eventually.</p><p><br /></p><p>[ATTACH=full]1435254[/ATTACH][/QUOTE]</p><p><br /></p>

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