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Combustive Comet Turquoise

#11ddcd
Notes

Combustive Comet Turquoise (#11DDCD) is a true cyan with a neon character. It sits at the high-saturation edge of its family. Use it sparingly, as signage, accent, or highlight against darker surfaces. Its HSL profile (175°, 86%, 47%) 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
#11ddcd
RGB
rgb(17, 221, 205)
HSL
hsl(175, 86%, 47%)
HWB
hwb(175 7% 13%)
OKLCH
oklch(80.8% 0.140 185.5)
HSV
hsv(175, 92%, 87%)
LAB
lab(79.75% -47.29 -4.73)
LCH
lch(79.75% 47.52 185.71)
CMYK
cmyk(92%, 0%, 7%, 13%)

Etymology

Combustive
adjective

Latin combūstus, burnt — adjectival suffix -ive, derived from com-burere (to burn-up). As a color modifier, combustive implies a saturated-and-burning-active quality, the bright color of blast-furnace-and-foundry combustion-chamber emission. Sits at the bright-and-warm end of the grid, parallel to fiery and blazing in usage.

Comet
modifier

Greek κομήτης, long-haired-or-tailed-star. As a color modifier, comet implies an icy-and-tailed-and-streaked quality, the visual register of Halley-and-Hale-Bopp-comet hand-icy-and-tailed-and-streaked Halley-and-Hale-Bopp-and-Encke-comet comet-and-icy-and-tailed-and-streaked surfaces under Halley-and-Hale-Bopp-and-Encke-comet sun-grazing-and-coma-and-ion-tail outer-system-arc-light. Sits at the modifier-and-cosmic end of the grid, parallel to meteor and nebula 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

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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.

#11ddcd
Original
#d1d0cd
Protanopia
#b9becf
Deuteranopia
#00e2d8
Tritanopia
#b0b0b0
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
1.71:1
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
12.25:1

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