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<p>[QUOTE=&quot;desertgem, post: 2513924, member: 15199&quot;]As the chemists will tell you, BD is not a disease , it is chemical reaction and as such it can not jump from one coin to another innocent one just nearby. What is happening is that both coin are in an environment that enhances the chemical reactions. Water vapor, high temperatures, energetic light source ( sun, uv-rich light), other chemicals used to clean them,&nbsp; etc. The environment isn&#039;t just part of the cause, it is the vast majority of the cause. Try this, put a BD coin into a zip lock bag and squeeze all air out and zip it. Do the same with a non-BD coin. Then put both into a 2nd zip lock bag with some modern zinc cents that you have scrubbed the heck out with a scrubber and seal it. The 100% scrubbed copper shell on the cent will react faster than the other coins surface. When the cents turn ugly with beginning corrosion, spend them and replace with newly scrubbed ones. Sacrifice the cents and protect the others. I have several older safes that are not air tight. I live in a desert that has occasional monsoon periods. I do not have any desiccation devices&nbsp; in any of them , just sacrificial cents, and I have no bronze disease type of corrosion since starting that many years ago. Only costs a few cents. I do replace the outer bag when changing cents. I have bought zip lock bags big enough for several old fashioned coin albums, and same results.&nbsp; I know that some US collectors will lament using &#039;valuable&#039; copper/zinc moderns, but ancients should have no such problem. I would and do use Thad&#039;s stuff on any similar corrosion. It can&#039;t stop BC ( Bronze cancer), but best for the purpose ( IMO). Jim[/QUOTE]</p><p><br /></p>

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