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Surveyed Mull Turquoise

#31b3be
Notes

Surveyed Mull Turquoise (#31B3BE) 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 (185°, 59%, 47%) 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
#31b3be
RGB
rgb(49, 179, 190)
HSL
hsl(185, 59%, 47%)
HWB
hwb(185 19% 25%)
OKLCH
oklch(70.4% 0.109 203.5)
P3
color(display-p3 0.3580 0.6921 0.7367)
HSV
hsv(185, 74%, 75%)
LAB
lab(66.98% -30.31 -15.59)
LCH
lch(66.98% 34.09 207.22)
CMYK
cmyk(74%, 6%, 0%, 25%)

Etymology

Surveyed
adjective

Old French surveer, to look upon — past-participle of survey. As a color modifier, surveyed implies a clear-and-measured-and-coordinated quality, the crisp color of Mason-Dixon-Line-and-Royal-Navy-Hydrographic scientific-and-cadastral land-and-sea surveying tradition. Sits at the crisp-and-mapped end of the grid, parallel to mapped and plotted in usage.

Mull
modifier

Middle English mullen, to-grind-or-ponder. As a color modifier, mull implies a slow-pondered-and-warmed-and-spiced quality, the visual register of mulled-wine-and-mulled-thought hand-slow-pondered-and-warmed-and-spiced mulled-wine-and-mulled-cider-and-mulled-thought mulled-and-slow-pondered-and-warmed-and-spiced surfaces under mulled-wine-and-mulled-cider-and-mulled-thought clove-and-cinnamon-and-orange-peel hearth-side-winter-light. Sits at the modifier-and-mood end of the grid, parallel to muse and brood in usage.

Turquoise
noun

The hydrated copper-aluminum phosphate mined in Persia and the American Southwest for thousands of years — the firuze of Iran, the chalchihuitl of Mesoamerica, the heart of Pueblo and Navajo silverwork. The color refers to a fine Sleeping Beauty turquoise from Arizona: a saturated, slightly green-shifted blue with the slight matrix of host-rock veining. Brighter than persian, lighter than cerulean.

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.

#31b3be
Original
#a4abbf
Protanopia
#919dbe
Deuteranopia
#00bab6
Tritanopia
#989898
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
2.52:1
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
8.32:1

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
##31B3BE
Display P3
Display P3
color(display-p3 0.3580 0.6921 0.7367)
P3 has subtle headroomOKLCH chroma 0.109

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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