Red, Red-Brown or Brown: why a penny's color matters

3 min read · Updated Oct 4, 2026

In short

Fresh copper looks orange-red and can turn brown over time. The codes are RD for Red, RB for Red-Brown and BN for Brown.
Original red color often commands more for otherwise comparable uncirculated coins.
Polishing does not restore the original surface and can damage the coin.

What the three labels mean

A copper coin's grade may be followed by a color designation, for example MS-64 RB.

RD (Red): original copper-red mint luster is largely preserved.
RB (Red-Brown): a mix of original red and brown patina.
BN (Brown): fully or predominantly brown surfaces.

In its red-copper guide, PCGS describes the RD threshold as at least 95% original red. NGC describes its categories principally through luster and patina. Borderline cases require expert judgment; a photograph cannot reliably measure that percentage. These are not exact color charts applied identically by every service.

The designations concern copper coins. An ordinary 1943 steel cent, for example, does not receive this copper-color designation.

Why pennies turn brown

Copper reacts with its environment, including air, moisture and substances on its surface. The gradual change from red to brown often forms a natural patina. Humidity and unsuitable storage can accelerate surface changes.

Why red can carry a premium

Many collectors value surviving original red on uncirculated copper. Penny Value therefore shows separate BN, RB and RD estimates when corresponding catalogue data is available. RD is often higher, but date, grade, spots and overall appearance still matter. Color alone does not guarantee a higher selling price.

For worn coins, date, mint mark, variety and condition usually matter more than traces of red.

Why polishing cannot restore the original

Polishing cannot recover an original surface that has changed. Rubbing may leave fine scratches; chemical treatment may produce artificial-looking color. A shiny cleaned coin is therefore not necessarily better preserved.

Improper cleaning or questionable color can prevent a normal numeric grade. A service may instead assign a Details designation identifying the surface problem. Such coins often sell for less than comparable untreated examples. Natural patina is not automatically damage; professional conservation differs from home polishing.

TipStore copper in a cool, dry place using suitable PVC-free holders. Our storage guide explains how to reduce contact and avoid harmful materials.

Photos and color

Reflections, shadows and camera white balance can make copper look lighter, darker or differently colored. Use soft, even lighting without color filters. Penny Value estimates color from photos; a professional assessment examines the physical coin.

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Penny Value is an Android app for now, so it isn't on the App Store. The values and checks on this page are free to use.Penny Value is an Android app. Open this page on your Android phone to check your own penny with a photo.

Coins in this guide

1943 Steel
Philadelphia · 684.6 million made
7.5¢worn
$2.00MS-60

Related guides

Sources

PCGS, “PCGS Grading Standards” (accessed 2026-09-26)
NGC, “Grading Lincoln Cents (1909-Date)” (accessed 2026-10-04)
NGC, “NGC Coin Grading Scale” (accessed 2026-10-04)
U.S. Mint, “Get Started Collecting Coins” (accessed 2026-09-26)
PCGS, “Coin Preservation” (accessed 2026-09-26)
PCGS, “What is a Red Copper Coin?” (accessed 2026-10-04)