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<p>[QUOTE=&quot;TypeCoin971793, post: 2415235, member: 78244&quot;]I recently got this coin, but the toning is a bit darker than I would like. I am thinking about reversing the toning process a little to brighten things up a bit. This is not the same thing as dipping which removes the silver sulfide layer from the coin. This method removes the sulfur from the silver while keeping the silver in place.</p><p><br /></p><p>The method:</p><p><br /></p><p>1. Line the bottom of a glass bowl or dish with aluminum foil.</p><p>2. Place the coin on the foil.</p><p>3. Pour a few tablespoons of sodium bicarbonate (baking soda) onto the coin and aluminum.</p><p>4. Pour in boiling water and stir lightly to dissolve the baking soda.</p><p>5. Let sit until the tarnish disappears.</p><p><br /></p><p><br /></p><p>What is going on here? Well, what is on the coin is Ag2S. We want Ag. So we add aluminum into the reaction to form Al2S3 from Al. This does not happen spontaneously, so we need to add a catylist (baking soda dissolved in water) and energy (boiling water) into the system to make the reaction occur spontaneously. The sulfur is transferred to the aluminum, leaving the silver atoms on the coin bare. I have done this a couple of times with coins that were toned completely black, and I was successful.</p><p><br /></p><p>Anyhoo, here is the coin in question. Opinions?[ATTACH=full]499739[/ATTACH][ATTACH=full]499740[/ATTACH][/QUOTE]</p><p><br /></p>

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