#53B1BAThalassa (#53B1BA) is a light, soft blue-green with an OKLCH hue of 204°, lightness 0.71 and chroma 0.089. 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 | #53B1BA |
|---|---|
| RGB | rgb(83, 177, 186) |
| HSL | hsl(185, 43%, 53%) |
| HSV | hsv(185, 55%, 73%) |
| CMYK | cmyk(55%, 5%, 0%, 27%) |
| CIE Lab | lab(67.1 -25.1 -13) |
| OKLCH | oklch(0.707 0.089 204) |
Under warm 2700K interior light Thalassa shifts subtly: leans toward green, loses intensity; in north-facing or shaded light it shifts subtly: drifts toward sky blue. Overall drift across common illuminants is small (max ΔE ≈ 2), so it is a lighting-stable choice.
#64adae — ΔE 2.0, shifts subtly: leans toward green, loses intensity#5db2b6 — ΔE 1.1, shifts subtly: leans toward green#53b1ba — ΔE 0.0, is virtually unchanged#52b2bd — ΔE 0.4, shifts subtly: drifts toward sky blueTest Thalassa 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 2.51:1 and against black 8.37:1, so black text is the stronger pairing. That pairing passes WCAG AA for body text. Avoid white 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.
#d1fbff · #89d9e1 · #53b1ba · #328b93 · #08656d · #004046
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.
#98d6c1 · #74c4bc · #53b1ba · #4d9ab1 · #4d84a4 · #4d6e92
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.
#aec2dd · #53b1ba · #439097 · #426798 · #00545b · #1e3048
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.
#c2f1f6 · #b0c9cb · #53b1ba · #af6965 · #40676b · #2d4749
The anchor as the only color in the room. True neutrals or complement-warmed near-neutrals let it stay dominant.
#faefee · #53b1ba · #79898a · #564e4e · #142425 · #020000
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.
#fceeed · #d5c6c5 · #ab9a98 · #362221 · #120303 · #53b1ba
The opposite hue on the perceptual wheel, tempered to field strength — warm/cool tension without vibration.
#d4dab4 · #53b1ba · #6e8bb4 · #a25e24 · #452a33 · #04110b
The complement's two neighbours instead of the complement itself — strong contrast with a lower clash risk.
#ffedeb · #53b1ba · #a87388 · #75411a · #3a0d23 · #190500
Three hues spaced evenly around the wheel; the anchor leads and the other two are held at supporting strength.
#fbecfc · #53b1ba · #9b779e · #674b00 · #2c1e00 · #030004
Two complementary pairs offset by 90° — the richest chord, kept usable by a strict lightness hierarchy.
#f2efff · #53b1ba · #877dad · #7a3a38 · #212300 · #060000
#6EBDC5 · #87C9D0 · #9ED6DB · #B5E2E6 · #CCEEF1
#3B929A · #23747B · #07575E · #003B40 · #002125
#69AEB5 · #7BAAAF · #8AA7AA
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.