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<p>[QUOTE=&quot;CoinKeeper, post: 1147766, member: 16707&quot;]You can boil water, dissolve baking powder in it, pour the solution into a cup with the insides layered with aluminum foil to make a toning removing solution. Place some silver in the cup (solution has to be still hot) and a chemical redox reaction occurs and only the toning will be removed. None of the silver reacts, so there is no damage done to the coin&#039;s surfaces. When the unwanted toning is gone, rinse in distilled water and air dry. This is preferable to dipping since it doesn&#039;t strip away any of the silver on the coin, just the toning (silver sulfide, and other oxidation products). The luster is not impaired with this process since once the toning is removed, the solution cannot eat at the silver. The reason is that the aluminum can only react with the toning, and not the silver itself. The baking soda acts as an electrolyte, and the heat increase the rate of toning removal.[/QUOTE]</p><p><br /></p>

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