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<p>[QUOTE=&quot;dltsrq, post: 21247020, member: 75482&quot;]Most ancient coins are relatively stable while in the ground but with bronze in particular, all bets are off once &quot;restored&quot; and exposed to a new environment. Harsh cleaning chemicals and atmospheric moisture are a recipe for potential disaster. I&#039;ve seen 2000-year-old bronze coins suddenly erupt with bronze disease and literally crumble to dust within a few weeks of the first sign of trouble. If the other elements are in place - copper and chlorine - a humid day can provide enough moisture to begin the reaction. Proper storage is key.[/QUOTE]</p><p><br /></p>

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