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Manic Day Turquoise

#18e7de
Notes

Manic Day Turquoise (#18E7DE) 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 (177°, 81%, 50%) places it in the highly saturated band at a mid lightness. Best used in small doses, like logos, CTAs, focus rings, or highlight text, where its saturation becomes a feature rather than noise. 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
#18e7de
RGB
rgb(24, 231, 222)
HSL
hsl(177, 81%, 50%)
HWB
hwb(177 9% 9%)
OKLCH
oklch(83.8% 0.142 189.7)
HSV
hsv(177, 90%, 91%)
LAB
lab(83.24% -46.52 -8.58)
LCH
lch(83.24% 47.31 190.45)
CMYK
cmyk(90%, 0%, 4%, 9%)

Etymology

Manic
adjective

Greek manikós, raving / mad — sharing root with mania. As a color modifier, manic implies a saturated-and-overstimulated-and-extreme quality, the bright color of Andy-Warhol-and-Pop-Art late-Pop-Art repeated-and-multiplied portrait color schemes. Sits at the bright-and-active end of the grid, parallel to hyper and frenetic in usage.

Day
modifier

Old English dæg, daylight period. As a color modifier, day implies a midday-and-broad-daylight quality, the visual register of Mediterranean-and-temperate mid-day full-sun atmospheric clarity-and-shadow open-sky working-and-walking surfaces under noon-day overhead light. Sits at the modifier-and-time end of the grid, parallel to noon and morn 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.

#18e7de
Original
#d9dade
Protanopia
#c0c8e0
Deuteranopia
#00ede4
Tritanopia
#bababa
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
1.55:1
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
13.52:1

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