Midnight Blue (#191970) is a very dark, moderately saturated blue hue. Midnight blue is a very dark blue that can replace black for a softer dark mode.
In RGB it is made of 25 red, 25 green and 112 blue. Its HSL hue angle is 240° with 64% saturation and 27% lightness, while its perceptual OKLCH lightness is 29% with a chroma of 0.144. For print, a starting CMYK mix is 78% cyan, 78% magenta, 0% yellow and 56% black.
As a text color on white, Midnight Blue has a contrast ratio of 14.85:1, which passes WCAG AA for normal text. On black it reaches 1.41:1 and fails AA. If you use Midnight Blue as a background, put white text on it. The APCA lightness contrast is Lc 0 for black text and Lc -104 for white text.
Its perceptual complement is #352A00, close to gunmetal. Colors that look most similar are navy blue, ultramarine, indigo. It looks fairly similar to people with red-green color blindness (ΔE 3), so its meaning mostly survives.