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<p>[QUOTE=&quot;robinjojo, post: 7843706, member: 110226&quot;]The rule of thumb that I have used to distinguish bronze disease from hard, green deposits, is that active bronze disease is a pale green to almost white appearance, and powdery, the sign that it is actively combining with moisture and air, eating away at the surface.</p><p><br /></p><p>I have coins that look as if they have bronze disease.&nbsp; They have green spots that are somewhat below the surface.&nbsp; But, they are hard, not soft or powdery, and cannot be scraped off with a finger nail.&nbsp; Now, it is possible that at some point there might have been some corrosion going on, but over the years or even centuries they have hardened and &quot;stabilized&quot;.&nbsp; I guess under the right conditions, such as lots of humidity over an extended period, corrosion might occur again, but then again maybe not.&nbsp; I figure that if it becomes an issue, I will be long gone - no sense thinking about that - enjoy the coins![/QUOTE]</p><p><br /></p>

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