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Pellucid Drear Topaz

#51bff2
Notes

Pellucid Drear Topaz (#51BFF2) 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 (199°, 86%, 63%) 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 orange. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#51bff2
RGB
rgb(81, 191, 242)
HSL
hsl(199, 86%, 63%)
HWB
hwb(199 32% 5%)
OKLCH
oklch(76.2% 0.123 231.7)
P3
color(display-p3 0.4368 0.7396 0.9298)
HSV
hsv(199, 67%, 95%)
LAB
lab(73.17% -15.85 -34.48)
LCH
lch(73.17% 37.95 245.31)
CMYK
cmyk(67%, 21%, 0%, 5%)

Etymology

Pellucid
adjective

Latin pellūcidus, transparent — derived from per-lūcēre (to shine through). As a color modifier, pellucid implies a clear-and-translucent quality where the hue reads with optical clarity and minimal turbidity. Sits at the crisp-and-clear end of the grid, parallel to lucid and translucent in usage.

Drear
modifier

Old English drēor, gore-and-sorrow. As a color modifier, drear implies a bleak-and-cheerless-and-sorrowful quality, the visual register of Brontë-moorland-and-Hardy-heath-drear hand-bleak-and-cheerless-and-sorrowful Brontë-moorland-and-Hardy-heath-and-Wuthering drear-and-bleak-and-cheerless-and-sorrowful surfaces under Brontë-moorland-and-Hardy-heath-and-Wuthering rain-swept-and-low-cloud-and-empty-vista Yorkshire-and-Wessex-light. Sits at the modifier-and-mood end of the grid, parallel to bleak and gloom in usage.

Topaz
noun

A fluorine aluminum silicate gem, hardness 8 on the Mohs scale, mined for centuries in Ouro Preto, Brazil. Imperial topaz is the prized variety: a warm, slightly pink-shifted gold-orange with the high refractive index of a quality cut stone. Cooler than amber, brighter than honey, with the gem's signature internal fire when held to light. Named for the island of Topazos in the Red Sea, though that source produced peridot instead.

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.

#51bff2
Original
#a6bdf4
Protanopia
#8fadf1
Deuteranopia
#00cdd0
Tritanopia
#ababab
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
2.08:1
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
10.08:1

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
##51BFF2
Display P3
Display P3
color(display-p3 0.4368 0.7396 0.9298)
P3 has subtle headroomOKLCH chroma 0.123

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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