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<p>[QUOTE=&quot;ArtDeco, post: 24841769, member: 119259&quot;]Hello all,</p><p><br /></p><p>I&#039;ve recently acquired this 1/2 Punic Shekel from an older friend who won it from a european auction a few years ago.</p><p><br /></p><p>The coin is in relatively good shape but there appears to be some reddish deposits on both the obverse and reverse of the coin, I&#039;ve read that these could be either iron oxides, copper oxides or cuprite, I&#039;ve successfully removed black iron oxides (horn silver) from coins in the past using the Sodium Thiosulphate method devised by [USER=100731]@Roerbakmix[/USER] which always worked.</p><p>Using that method on this coin did not help much with the reddish deposits, if these deposits are in fact copper oxides than I would need a different procedure.</p><p><br /></p><p>I&#039;ve read that a combination of vinegar + salt can eat away at copper oxides but I just want to be sure if this would be recommended for silver coins since this solution is slightly acidic.</p><p>If I were to create this solution, would the tempreture of the solution matter? Should I make it at room tempreture or should I heat it up in the microwave?</p><p><br /></p><p><br /></p><p>Here are some magnified photos of the deposits,</p><p><br /></p><p><img src="https://i.imgur.com/WEvd2or.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><img src="https://i.imgur.com/XRd2l9a.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><img src="https://i.imgur.com/6CKL27b.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />[/QUOTE]</p><p><br /></p>

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