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Learn Grading: What Are BN, RB And RD? (Brown, Red Brown, & Red)

 
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1411 Posts
 Posted 10/30/2020  5:05 pm Show Profile   Bookmark this topic Add CCFPress to your friends list Get a Link to this Message
NGC - NGC uses a numeric grade to succinctly describe a problem-free coin's condition. Certain coins, however, require a more nuanced description of their condition and appearance. For these coins, NGC graders follow the numeric grade with a range of designations, often called "Strike Characters."

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Among the most common strike characters are those used for copper coins. When copper coins are struck, they typically display distinctive red luster. Over time, this red luster fades and eventually turns to a rich brown patina. NGC uses three primary strike characters after the numeric grade to describe the amount of red and brown present on the coin's surfaces: "RD" (for red), "RB" (for red brown) and "BN" (for brown).

A coin with a RD strike character must exhibit at least 85% of its original red luster.



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Australia
17604 Posts
 Posted 10/30/2020  7:54 pm  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
The red of a freshly struck copper or bronze coin can be preserved, but usually, storage in an airtight capsule is required.

Nevertheless, I have seen many uncirculated examples of Indian Quarter Annas over a century old, that have retained almost all of their original red luster, albeit often with small (sulfide/oxide) 'carbon spots'.
Examples have been posted here in the CCF.

Pure copper without any oxide or sulfide at all, is pinkish red in color.
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