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<p>[QUOTE=&quot;altaycoins, post: 3185100, member: 16466&quot;]As [USER=76194]@Sallent[/USER] pointed out already it does not prevent BD. It can prevent only if the BD&nbsp; is totally cleaned from the coin and wax is applied properly. But it can be difficult to clean the BD completely. Since BD is an autocatalytic reaction, any trace amount of moisture or HCl left on the coin can trigger it. Best thing to do is to keep an eye on the coin.</p><p><br /></p><p>And NGC certainly does not guarantee the aucthenticity:</p><p><br /></p><blockquote><p>&quot;NGC Ancients will only grade coins that it believes to be genuine. <u>Authenticity and attribution represent the opinion of NGC Ancients and are not guaranteed, nor is any guarantee implied.</u> Please see the <a href="https://www.ngccoin.com/specialty-services/ancient-coins/guarantee.aspx" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.ngccoin.com/specialty-services/ancient-coins/guarantee.aspx" rel="nofollow">NGC Ancients Coin Grading Guarantee</a> for complete information.&quot; Source: <a href="https://www.ngccoin.com/specialty-services/ancient-coins/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.ngccoin.com/specialty-services/ancient-coins/" rel="nofollow">NGC Ancients</a></p></blockquote><p>[/QUOTE]</p><p><br /></p>

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