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<p>[QUOTE=&quot;robinjojo, post: 5200714, member: 110226&quot;]Yes, silver is extremely reactive to sulfur.&nbsp; Exposure to it can turn it black very quickly, especially if the coin is heated in the oven.</p><p><br /></p><p>Controlling the process is key. </p><p><br /></p><p>Liver of sulfur will darken metals, except gold.&nbsp; This is especially true for silver, copper and bronze.&nbsp; Using the correct concentration is very important.&nbsp; Generally speaking, it is best to use a more diluted concentration to have more control with the process. </p><p><br /></p><p>If any heating is done, it is to the &quot;bath&quot; and not the coin or object. The purpose of the heating is to achieve better dissolving of the sulfur in the water, which should be distilled water.&nbsp; The coin or object should be room temperature.&nbsp; Heating it with the sulfur solution on it will create an undesirable black (unless that&#039;s the objective).</p><p><br /></p><p>I recently got a nice Philip II coin of Naples.&nbsp; Unfortunately it was cleaned to the point of being extremely shiny.&nbsp; I applied a very diluted sulfur solution to it for only a minute at the most.&nbsp; This process darkened the coin somewhat, but the fact is the cleaning remains.&nbsp; However, given time, the coin will assume a somewhat more attractive appearance, although the label includes the notation &quot;harshly cleaned&quot;.[/QUOTE]</p><p><br /></p>

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