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<p>[QUOTE=&quot;GDJMSP, post: 1273414, member: 112&quot;]Copper, just like silver and gold, can be dipped. So the answer to your question is yes.</p><p><br /></p><p>There are a great many copper coins in slabs with the designation Red. But yet when viewed today the coin would obviously no longer qualify for that designation. Instead, if graded today the coin would grade Red Brown or Brown. In other words, the coin&#039;s color has changed in the slab - the coin has toned while it was in the slab.</p><p><br /></p><p>Now many of these coins are 50 to 100 years old or older. But yet they were given the Red designation when they were graded. So how is it that the coin managed to stay Red for 50-80 years, or longer, but then turned Red Brown or Brown in just a few short years while in the slab ?</p><p><br /></p><p>The answer is they didn&#039;t stay Red all those years. The coins were dipped before graded thus allowing them to get the Red designation. But the coin re-toned while in the slab.</p><p><br /></p><p>This is why NGC, for many years, would extend no guarantee whatsoever on the color designation of copper coins. And then when they decided to change their policy, would only offer a guarantee on the color for 10 years. It is also why PCGS no longer offers a color guarantee on copper color at all.[/QUOTE]</p><p><br /></p>

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