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<p>[QUOTE=&quot;dougsmit, post: 1924335, member: 19463&quot;]I see no beaten bushes here just the same question over and over with the same answer.&nbsp; Bronze disease is a specific problem different from other corrosion in that it sustains itself even after having been removed from the circumstances (soil, flips, ink bottles, whatever) that created it and will continue to grow until it consumes the coin.&nbsp;&nbsp; If you get a tooth filling,&nbsp; the dentist first removes all the bad rot.&nbsp; If some is missed, the rot will return.&nbsp; For the rest of your life, every six months you go back to the dentist and he checks for signs of returned rot around fillings.&nbsp;&nbsp; Other coin corrosion is more like stain from drinking coffee.&nbsp; Whether you clean it off or not, it only gets worse if you drink more coffee.&nbsp; </p><p><br /></p><p>I would still appreciate&nbsp; answers from a specialist in modern coins:&nbsp; Do you see BD in modern coins?&nbsp; If so, it it only on coins found in the ground (by detectorists)?&nbsp; BD is a matter of concern to ancient collectors.&nbsp; Is it something of concern with coins of 1500?&nbsp; When do you start seeing coins with the BD problem?&nbsp;&nbsp; Personally, I have seen few BD coins less than about 1800 years old but that is not a scientific study.&nbsp; I do know that they come much more frequently from coins of certain regions and times but I do not know how much of that is alloy, soil conditions in those regions or the chemicals used on the coins by finders in some places.&nbsp; Has there been a serious scientific study on BD?&nbsp; I do not know.[/QUOTE]</p><p><br /></p>

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