#143C5DPoseidon (#143C5D) is a very dark, soft blue with an OKLCH hue of 247°, lightness 0.35 and chroma 0.073. 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 | #143C5D |
|---|---|
| RGB | rgb(20, 60, 93) |
| HSL | hsl(207, 65%, 22%) |
| HSV | hsv(207, 78%, 36%) |
| CMYK | cmyk(78%, 35%, 0%, 64%) |
| CIE Lab | lab(24.2 -1.2 -23.7) |
| OKLCH | oklch(0.346 0.073 247) |
Under warm 2700K interior light Poseidon shifts only faintly, with no single dominant change; in north-facing or shaded light it is virtually unchanged. Overall drift across common illuminants is small (max ΔE ≈ 1.2), so it is a lighting-stable choice.
#1c3b57 — ΔE 1.2, shifts only faintly, with no single dominant change#193d5b — ΔE 0.7, is virtually unchanged#143c5d — ΔE 0.0, is virtually unchanged#133c5e — ΔE 0.2, is virtually unchangedTest Poseidon 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 11.45:1 and against black 1.83:1, 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.
#93aec8 · #6a89a5 · #436483 · #143c5d · #00223e · #000615
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.
#2e626e · #1b4f67 · #143c5d · #17294c · #161739 · #110724
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.
#b0a7c4 · #7092b1 · #766796 · #575066 · #143c5d · #01223d
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.
#d9af84 · #65798b · #4d5863 · #143c5d · #0d2031 · #010710
The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.
#f7f1eb · #b2bac2 · #87827e · #4a535b · #143c5d · #27221d
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.
#f7f0ea · #d1c9c1 · #a69d94 · #30261b · #0e0500 · #143c5d
The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.
#d3d6b0 · #8fc0d5 · #eb6427 · #6c444e · #143c5d · #0a0a33
The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.
#fdefe2 · #dcac9e · #90844e · #704438 · #143c5d · #28230c
Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.
#ffecef · #dcaab2 · #778c5a · #485830 · #143c5d · #321b20
Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.
#fcecf7 · #d3abc7 · #a27b51 · #315c43 · #143c5d · #2f1f0e
#375877 · #587692 · #7B95AD · #9FB5C9 · #C4D5E6
#0E3350 · #082944 · #042038 · #01182C · #000F21
#1F3C56 · #273C4E · #2E3B47
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.