Charcoal (#36454F) is a dark, muted blue hue. Charcoal is a dark blue-grey, a popular replacement for black in modern UI text.
In RGB it is made of 54 red, 69 green and 79 blue. Its HSL hue angle is 204° with 19% saturation and 26% lightness, while its perceptual OKLCH lightness is 38% with a chroma of 0.026. For print, a starting CMYK mix is 32% cyan, 13% magenta, 0% yellow and 69% black.
As a text color on white, Charcoal has a contrast ratio of 9.9:1, which passes WCAG AA for normal text. On black it reaches 2.12:1 and fails AA. If you use Charcoal as a background, put white text on it. The APCA lightness contrast is Lc 11 for black text and Lc -97 for white text.
Its perceptual complement is #4E4035, close to taupe. Colors that look most similar are taupe, gunmetal, eggplant. It looks fairly similar to people with red-green color blindness (ΔE 1), so its meaning mostly survives.