#151931Dark Knight (#151931) is a very dark, muted blue with an OKLCH hue of 275°, lightness 0.22 and chroma 0.047. It sits on the cool side of the color wheel. In practice it behaves as a grounding tone — suited to text, outlines, and shadowed surfaces.
| HEX | #151931 |
|---|---|
| RGB | rgb(21, 25, 49) |
| HSL | hsl(231, 40%, 14%) |
| HSV | hsv(231, 57%, 19%) |
| CMYK | cmyk(57%, 49%, 0%, 81%) |
| CIE Lab | lab(9.6 6.4 -16.6) |
| OKLCH | oklch(0.223 0.047 275) |
Under warm 2700K interior light Dark Knight shifts subtly: leans toward purple; in north-facing or shaded light it is virtually unchanged. Overall drift across common illuminants is small (max ΔE ≈ 0.8), so it is a lighting-stable choice.
#17182d — ΔE 0.8, shifts subtly: leans toward purple#171930 — ΔE 0.4, shifts subtly: leans toward purple#151931 — ΔE 0.0, is virtually unchanged#151932 — ΔE 0.2, is virtually unchangedTest Dark Knight in the color lighting simulator — sweep it through daylight, warm 2700K light, 4000K LED, and shade alongside the rest of your palette.
Against white it measures 17.28:1 and against black 1.22:1, so white text is the stronger pairing. That pairing passes WCAG AA for body text. Avoid black text on this color entirely.
One color explored: close hues with real lightness and chroma structure, so the palette is the anchor through value rather than a set of colors.
#969aad · #70758a · #4d5268 · #2c3148 · #151931 · #01000a
The anchor's neighbours on the wheel — everything shares an undertone, so the chord carries color without anything having to be muted to get along.
#214f61 · #163c57 · #13294b · #151931 · #11082a · #0c0117
The mid-gap pairing — sage and mustard, terracotta and olive. A foil rotated 40–65° toward warm or cool: too far to be kin, too near to argue, carried by temperature and a deliberate value offset.
#b49db3 · #7c85ac · #815a81 · #444b71 · #3e2d3e · #151931
One deliberately opposed voice — a single restrained counterpoint across the wheel, or temperature against temperature where the anchor is too muted to carry a loud opposite.
#d3c48c · #6e7282 · #4d5269 · #333542 · #151931 · #030313
The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.
#f4f2ea · #a9acb6 · #6d6b66 · #2e313a · #151931 · #090804
This color as a ground rather than a subject — its own restraint held across a narrow value band, carrying one saturated voice from the opposite temperature.
#eef1fe · #c5c9d7 · #989cad · #151931 · #020313 · #e0c34d
The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.
#f6f2e1 · #b8ac81 · #796b35 · #3b3001 · #151931 · #050617
The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.
#f6f2e1 · #c7a585 · #627342 · #472907 · #151931 · #050a00
Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.
#ffede9 · #cf9f93 · #467858 · #103a22 · #151931 · #140301
Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.
#ffecf0 · #ce9da7 · #796b35 · #003a35 · #151931 · #0c0700
#333850 · #555A70 · #7A7E92 · #A0A4B5 · #C8CCD9
#12162B · #0F1226 · #0C0F21 · #090C1B · #070916
#161A2D · #171A28 · #191B23
As a deep tone it works for grounding elements — text, outlines, and shadowed surfaces — rather than open fields. In palettes it pairs most predictably with its tonal ramp and analogous neighbors; reserve the complementary hue for small, deliberate contrast.