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<p>[QUOTE=&quot;Conder101, post: 279078, member: 66&quot;]If the coin is too worn the acid will not bring the date back.&nbsp; When it i struck there is a slight difference in the metal density between the date area and the surrounding area, but that difference only goes a very short way into the coin.&nbsp; If the date is gone and it is worn down past that difference level it will eat away at the metal evenly an no date will appear.&nbsp; In the case of the date just starting to appear and then no further change, that is because most of the date was worn past that level of no return.&nbsp; You got back what you could but from that point on the coin was reacting equally in both the date and non date areas so there was no further change.[/QUOTE]</p><p><br /></p>

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