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Placid Mope Verdigris

#51b9b7
Notes

Placid Mope Verdigris (#51B9B7) 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 (179°, 43%, 52%) 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
#51b9b7
RGB
rgb(81, 185, 183)
HSL
hsl(179, 43%, 52%)
HWB
hwb(179 32% 27%)
OKLCH
oklch(72.5% 0.096 193.5)
P3
color(display-p3 0.4286 0.7165 0.7137)
HSV
hsv(179, 56%, 73%)
LAB
lab(69.37% -30.27 -8.07)
LCH
lch(69.37% 31.33 194.93)
CMYK
cmyk(56%, 0%, 1%, 27%)

Etymology

Placid
adjective

Latin placidus, gentle / quiet — derived from placēre (to please). As a color modifier, placid implies a clear-and-unruffled quality where the hue carries the visual register of mirror-smooth lake-surface in windless mid-morning. Sits at the crisp-and-calm end of the grid, parallel to serene and peaceful in usage.

Mope
modifier

Origin obscure, attested c. 1568, to-be-listless-and-dejected. As a color modifier, mope implies a listless-and-dejected-and-slumped quality, the visual register of Victorian-melancholy-and-rainy-Sunday-mope hand-listless-and-dejected-and-slumped Victorian-melancholy-and-rainy-Sunday-and-bored-afternoon moped-and-listless-and-dejected-and-slumped surfaces under Victorian-melancholy-and-rainy-Sunday-and-bored-afternoon dripping-eaves-and-grey-window slumped-window-seat-light. Sits at the modifier-and-mood end of the grid, parallel to brood and sigh 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.

#51b9b7
Original
#afb1b7
Protanopia
#9ea4b8
Deuteranopia
#00beb8
Tritanopia
#a3a3a3
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
2.34:1
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
8.97:1

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
##51B9B7
Display P3
Display P3
color(display-p3 0.4286 0.7165 0.7137)
P3 has subtle headroomOKLCH chroma 0.096

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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