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Healthful Eros Lagoon

#42b6cf
Notes

Healthful Eros Lagoon (#42B6CF) 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 (191°, 59%, 54%) 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
#42b6cf
RGB
rgb(66, 182, 207)
HSL
hsl(191, 59%, 54%)
HWB
hwb(191 26% 19%)
OKLCH
oklch(72.2% 0.108 214.9)
P3
color(display-p3 0.3928 0.7042 0.7995)
HSV
hsv(191, 68%, 81%)
LAB
lab(68.84% -24.36 -22.11)
LCH
lch(68.84% 32.90 222.24)
CMYK
cmyk(68%, 12%, 0%, 19%)

Etymology

Healthful
adjective

Old English hǣlth, health — adjectival suffix -ful. As a color modifier, healthful implies a clear-and-vital-and-wholesome quality where the hue carries the visual register of fresh-air-and-sunlight outdoor health-promoting environment. Sits at the crisp-and-wholesome end of the grid, parallel to salubrious and wholesome in usage.

Eros
modifier

Greek Ἔρως, god-of-love-and-desire. As a color modifier, eros implies a winged-love-and-arrow-of-desire quality, the visual register of Praxiteles-Eros-and-Roman-Cupid hand-winged-love-and-arrow-of-desire Praxiteles-Eros-and-Roman-Cupid-and-Pompeii-fresco eros-and-winged-love-and-arrow-of-desire surfaces under Praxiteles-Eros-and-Roman-Cupid-and-Pompeii-fresco Hellenistic-and-Roman-Pompeii rose-and-myrtle-light. Sits at the modifier-and-myth end of the grid, parallel to zeus and hera 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.

#42b6cf
Original
#a4b0d0
Protanopia
#90a2cf
Deuteranopia
#00bfbe
Tritanopia
#9f9f9f
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
2.38:1
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
8.82:1

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
##42B6CF
Display P3
Display P3
color(display-p3 0.3928 0.7042 0.7995)
P3 has subtle headroomOKLCH chroma 0.108

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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