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<p>[QUOTE=&quot;robinjojo, post: 4433824, member: 110226&quot;]Those deposits look, as you say, rock hard.&nbsp; Removing deposits like the one on this coin is problematic, especially for bronzes.&nbsp; </p><p><br /></p><p>Muriatic (hydrochloric) acid is very powerful and must be used in diluted form, preferably pre-diluted.&nbsp; This is a very hazardous acid to use, and it is best used in a laboratory.&nbsp; The fumes are especially hazardous.&nbsp; It you&#039;re intent on using acid, please be careful, and use protective items, including gloves and face protection (googles).&nbsp; Use this acid in a well ventilated area, and avoid the fumes.&nbsp; I never used this acid on any coin, and I would hesitate to do so now.</p><p><br /></p><p>I would start conservatively, with a very long soak in distilled water.&nbsp; See if anything comes loose with the aid of a toothpick.&nbsp; Some older collectors and dealers used to soak coins in olive oil for several weeks or longer.&nbsp; You could try that approach as well.</p><p><br /></p><p>I view this coin as a situation of mitigation, at best.&nbsp; If you can remove some of the deposits, without damaging the nice patinated areas, that might be the best that can be done for this coin.</p><p><br /></p><p>One more approach, that does use an acid, is Naval Jelly.&nbsp; This is a readily available and popular rust remover.&nbsp; Care must be used when applying to the coin; apply only to the affected areas.&nbsp; Leave it on for about 10 minutes or so maximum, then try to dislodge the deposits using a wood toothpick.&nbsp; Rise the coin with distilled water and examine.&nbsp; Repeat the process until you reach the point where you&#039;re satisfied with the results.&nbsp; Don&#039;t leave this acid on the coin too long as it will eventually dissolve all deposits and expose bare metal.&nbsp; </p><p><br /></p><p>I normally do not use Naval Jelly on bronze coins (really only when dealing with bronze disease).&nbsp; It is more effective in some cases on silver coins with earthy deposits.[/QUOTE]</p><p><br /></p>

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