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Reliable Hollow Verdigris

#24a7a3
Notes

Reliable Hollow Verdigris (#24A7A3) 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 (178°, 65%, 40%) 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
#24a7a3
RGB
rgb(36, 167, 163)
HSL
hsl(178, 65%, 40%)
HWB
hwb(178 14% 35%)
OKLCH
oklch(66.2% 0.106 191.7)
P3
color(display-p3 0.3192 0.6454 0.6357)
HSV
hsv(178, 78%, 65%)
LAB
lab(62.21% -34.12 -7.72)
LCH
lch(62.21% 34.99 192.75)
CMYK
cmyk(78%, 0%, 2%, 35%)

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.

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.

Verdigris
noun

The basic copper carbonate that forms on weathered copper and bronze — the pigment scraped from oxidized metal and used in Renaissance painting before being supplanted by more stable greens. The color refers to a thick verdigris on aged copper roofing or the Statue of Liberty's surface: a soft, slightly muted blue-green with the powdery finish of mineral oxide. Cooler than patina, warmer than seafoam, with the archaeological weight of a mineral made by time.

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.

#24a7a3
Original
#9c9ea3
Protanopia
#8a91a4
Deuteranopia
#00aca5
Tritanopia
#8b8b8b
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
2.94:1
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
7.13:1

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
##24A7A3
Display P3
Display P3
color(display-p3 0.3192 0.6454 0.6357)
P3 has subtle headroomOKLCH chroma 0.106

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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