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<p>[QUOTE=&quot;desertgem, post: 876977, member: 15199&quot;]As I recall, Nic-a-date is primarily Ferric chloride which is a copper etching agent. I used to use it i making printed circuit boards. It doesn&#039;t remove nickel from the coin, but since copper is 75% of the coin, it has the effect it does. Now you might ask, how can it make the date re-appear if the whole surface of the coin is the same composition? The explanation is that when the planchet is struck, the pressure causes differential &quot;work hardening&quot; between the date and the field, and this difference allows a difference in the etching depth. </p><p><br /></p><p>Now as to silver, the coin is 90% silver generally, and the work hardening effects on striking silver doesn&#039;t seem to be as differential, so something that dissolves silver would have to have good resolution in distinguishing the difference in the date as compared to the fields. I suspect a cyanide solution may be what Ziggy&#039;s sister is thinking of, as I have head of people using a dip solution to no effect.</p><p><br /></p><p>Many have tried this, but I have never heard of enough success, and 1916 AG dimes and unknown date &quot;D&quot; mint merc dimes have initiated many attempts to find a 1916-D.[/QUOTE]</p><p><br /></p>

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