#005A6FDeep Lagoon (#005A6F) is a dark, soft sky blue with an OKLCH hue of 221°, lightness 0.43 and chroma 0.079. It sits on the cool side of the color wheel. In practice it behaves as a mid-weight working color for secondary surfaces and editorial blocks.
| HEX | #005A6F |
|---|---|
| RGB | rgb(0, 90, 111) |
| HSL | hsl(191, 100%, 22%) |
| HSV | hsv(191, 100%, 44%) |
| CMYK | cmyk(100%, 19%, 0%, 56%) |
| CIE Lab | lab(34.9 -14.8 -18.5) |
| OKLCH | oklch(0.433 0.079 221) |
Under warm 2700K interior light Deep Lagoon shifts subtly: leans toward blue-green; in north-facing or shaded light it shifts subtly: leans toward blue. Overall drift across common illuminants is small (max ΔE ≈ 1.4), so it is a lighting-stable choice.
#1a5868 — ΔE 1.4, shifts subtly: leans toward blue-green#105b6d — ΔE 0.8, shifts subtly: leans toward blue-green#005a6f — ΔE 0.0, is virtually unchanged#005a71 — ΔE 0.3, shifts subtly: leans toward blueTest Deep Lagoon 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 7.8:1 and against black 2.69:1, 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.
#7dafc0 · #508a9d · #005a6f · #004353 · #00212b · #00050a
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.
#447e7a · #256d74 · #005a6f · #0e4662 · #153252 · #162040
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.
#9fa7c5 · #7a87bb · #656c84 · #005a6f · #003d4c · #00222c
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.
#c58974 · #617379 · #005a6f · #163943 · #001d26 · #000509
The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.
#f9efec · #a1aeb2 · #6e6866 · #005a6f · #2e3b40 · #030101
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.
#faefeb · #d4c7c3 · #a99b96 · #34241e · #110401 · #005a6f
The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.
#dee1bc · #98cfc4 · #e5912e · #8b595e · #005a6f · #04100f
The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.
#ffeee7 · #d09ba1 · #876233 · #005a6f · #562930 · #130600
Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.
#feecf7 · #c89cb7 · #746b31 · #005a6f · #403906 · #040002
Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.
#f7eefe · #b8a0c9 · #915a46 · #005a6f · #2c4018 · #0e0100
#357386 · #598C9D · #7CA7B5 · #9FC2CE · #C2DDE6
#004B5D · #003D4C · #002F3B · #00222C · #00151D
#225869 · #335762 · #3F545C
Its moderate chroma lets it work in mid-size areas — upholstery, secondary UI surfaces, editorial blocks — without overwhelming neighbors. In palettes it pairs most predictably with its tonal ramp and analogous neighbors; reserve the complementary hue for small, deliberate contrast.