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Reliable Brine Lagoon

#31b2d2
Notes

Reliable Brine Lagoon (#31B2D2) is a true cyan with a cool character. It leans cool, sitting on the blue, green, and violet side of the wheel. Quiet and dependable, a fit for product UI and data visualization. Its HSL profile (192°, 64%, 51%) places it in the balanced band at a mid lightness. It works across type, buttons, and borders, saturated enough to feel deliberate but balanced enough to not fight the rest of the palette. For a confident two-color system, pair it with its complementary red. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#31b2d2
RGB
rgb(49, 178, 210)
HSL
hsl(192, 64%, 51%)
HWB
hwb(192 19% 18%)
OKLCH
oklch(70.9% 0.116 218.8)
P3
color(display-p3 0.3563 0.6883 0.8092)
HSV
hsv(192, 77%, 82%)
LAB
lab(67.38% -23.53 -26.02)
LCH
lch(67.38% 35.08 227.88)
CMYK
cmyk(77%, 15%, 0%, 18%)

Etymology

Reliable
adjective

Latin re-ligāre, to bind back — adjectival suffix -able. As a color modifier, reliable implies a clear-and-trustworthy-and-consistent quality where the hue carries the visual register of dependable-and-consistent design-element. Sits at the crisp-and-honest end of the grid, parallel to dependable and trustworthy in usage.

Brine
modifier

Old English brȳne, salt-water-or-pickle-brine. As a color modifier, brine implies a salt-water-and-pickle-and-tide-pool quality, the visual register of Atlantic-tide-pool-and-pickling-brine hand-salt-water-and-pickle-and-tide-pool Atlantic-tide-pool-and-pickling-brine-and-Cornish-rock-pool brine-and-salt-water-and-pickle surfaces under Atlantic-tide-pool-and-pickling-brine-and-Cornish-rock-pool Lizard-Point-and-North-Cornish-coast salt-tide-pool-light. Sits at the modifier-and-weather end of the grid, parallel to floe and torrent in usage.

Lagoon
noun

A shallow body of saltwater partially or fully enclosed by a barrier — coral atoll lagoons in the Pacific, Venice's Laguna Veneta, the Florida Keys' backcountry. The color refers to the average reflectance of a calm tropical lagoon at midday: a saturated, slightly muted blue-green with the optical clarity of shallow water over white sand. Brighter than reef, cooler than aquamarine, with the postcard weight of a Pacific atoll seen from above.

Closest matches

The nearest named color in three reference sources, ranked by perceptual distance (ΔE76 in CIELAB). ΔE < 1 is imperceptible to most viewers; ΔE > 10 is clearly different. When two sources point to the same hex they’re merged into one tile; click any to open that color’s page.

Variations

Click any swatch to explore

Harmonies

Accessibility

Color-vision simulation

How this color appears to viewers with the four major color-vision-deficiency types. Computed via the Machado (2009) physiologically-based model. If a tile matches the original, the color reads the same to that viewer.

#31b2d2
Original
#9eadd4
Protanopia
#889dd2
Deuteranopia
#00bdbc
Tritanopia
#999999
Achromatopsia
WCAG contrast

The color used as foreground text against pure white and pure black, with the contrast ratio and WCAG 2.1 grade. Aim for AA (4.5:1) for body text and AA Large (3:1) for 18 pt+ headlines; AAA (7:1) is the gold standard for long-form reading surfaces.

The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
Failon White
2.49:1
The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
AAAon Black
8.43:1

Wide gamut

Display P3 representation

The CSS Color 4 wide-gamut form of this color. Both swatches render the same color on every display — the P3 form only diverges from sRGB when a designer pushes channels outside sRGB's reach.

sRGB hex
sRGB hex
##31B2D2
Display P3
Display P3
color(display-p3 0.3563 0.6883 0.8092)
P3 has subtle headroomOKLCH chroma 0.116

Moderately saturated colors gain a small bump in P3 — the difference is usually visible side-by-side on wide-gamut hardware but won't change the character of the color.

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