Copper (#B87333) is a medium, moderately saturated orange hue. Copper is a reddish metallic brown, trendy in kitchenware and lighting.
In RGB it is made of 184 red, 115 green and 51 blue. Its HSL hue angle is 29° with 57% saturation and 46% lightness, while its perceptual OKLCH lightness is 62% with a chroma of 0.117. For print, a starting CMYK mix is 0% cyan, 38% magenta, 72% yellow and 28% black.
As a text color on white, Copper has a contrast ratio of 3.79:1, which passes AA only for large text and UI parts. On black it reaches 5.54:1 and passes AA for normal text. If you use Copper as a background, put black (or very dark) text on it. The APCA lightness contrast is Lc 39 for black text and Lc -71 for white text.
Its perceptual complement is #368EC5, close to steel blue. Colors that look most similar are caramel, bronze, burnt orange. It looks fairly similar to people with red-green color blindness (ΔE 8), so its meaning mostly survives.