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<p>[QUOTE=&quot;red_spork, post: 3193772, member: 74282&quot;]Many bronzes are at least partially darkened in one way or the other. One of the common ways is with a sugary syrup which is baked onto the coin. If done right it will not leave any stickiness or discernible smell behind. Another method is using a mixture of powdered sulphur and Vaseline or some other type of thick oil. Often cleaners will use a tiny amount of this on a toothpick to darken any scratches during cleaning and wash it off when done or even coat the surface of a coin with this mixture during mechanical cleaning so that it lubricates the surface and darkens any scratches thay might be made.[/QUOTE]</p><p><br /></p>

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