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Tucked Hollow Lagoon

#31b7d7
Notes

Tucked Hollow Lagoon (#31B7D7) is a true cyan with a vibrant character. It holds its own as a focal accent, carrying visual weight without tipping into neon territory. Its HSL profile (192°, 67%, 52%) 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
#31b7d7
RGB
rgb(49, 183, 215)
HSL
hsl(192, 67%, 52%)
HWB
hwb(192 19% 16%)
OKLCH
oklch(72.3% 0.119 218.1)
P3
color(display-p3 0.3645 0.7076 0.8287)
HSV
hsv(192, 77%, 84%)
LAB
lab(69.06% -24.46 -26.20)
LCH
lch(69.06% 35.84 226.97)
CMYK
cmyk(77%, 15%, 0%, 16%)

Etymology

Tucked
adjective

Old English tūcian, to torment / pull — past-participle of tuck. As a color modifier, tucked implies a clear-and-fitted-and-arranged quality where the hue carries the visual register of carefully-tucked-and-neatly-fitted shirt-into-trouser dress-attire. Sits at the crisp-and-finished end of the grid, parallel to trim and pressed in usage.

Hollow
modifier

Old English holh, hollow-place. As a color modifier, hollow implies a scooped-and-empty-and-resonant quality, the visual register of bell-and-gourd-and-tree-hollow hand-scooped-and-empty-and-resonant bell-and-gourd-and-tree-hollow hollowed-and-scooped-and-empty-and-resonant surfaces under bell-and-gourd-and-tree-hollow campanile-and-harvest-and-old-oak resonant-and-empty-light. Sits at the modifier-and-mood end of the grid, parallel to void and blank 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.

#31b7d7
Original
#a3b2d9
Protanopia
#8ca2d7
Deuteranopia
#00c2c1
Tritanopia
#9d9d9d
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
2.36:1
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
8.89:1

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
##31B7D7
Display P3
Display P3
color(display-p3 0.3645 0.7076 0.8287)
P3 has subtle headroomOKLCH chroma 0.119

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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