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Buttressed Pimento Ruby

#a51822
Notes

Buttressed Pimento Ruby (#A51822) is a true red with a jewel character. It carries the deep, saturated richness of a gemstone. Authoritative and slightly formal, it works well for type and heavy UI elements. Its HSL profile (356°, 75%, 37%) 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 cyan. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#a51822
RGB
rgb(165, 24, 34)
HSL
hsl(356, 75%, 37%)
HWB
hwb(356 9% 35%)
OKLCH
oklch(46.6% 0.174 24.6)
P3
color(display-p3 0.5936 0.1573 0.1587)
HSV
hsv(356, 85%, 65%)
LAB
lab(35.54% 54.70 33.13)
LCH
lch(35.54% 63.95 31.20)
CMYK
cmyk(0%, 85%, 79%, 35%)

Etymology

Buttressed
adjective

Old French bouterez, thrusting-mass — past-participle of buttress, derived from bouter (to thrust). As a color modifier, buttressed implies a saturated-and-architecturally-supported quality, the deep-rich color of Gothic-Cathedral flying-buttress-and-rib-vault stone-architecture. Sits at the bold-and-fortified end of the grid, parallel to fortified and reinforced.

Pimento
modifier

Spanish pimiento, sweet-red-Iberian-capsicum. As a color modifier, pimento implies a sweet-red-Iberian-capsicum-and-allspice-berry quality, the visual register of Spanish-and-Jamaican-pimento hand-sweet-red-Iberian-capsicum-and-allspice-berry Spanish-and-Jamaican-pimento-and-allspice-berry pimento-and-sweet-red-Iberian-capsicum surfaces under Spanish-and-Jamaican-pimento-and-allspice-berry Iberian-and-Jamaican-Blue-Mountain Iberian-and-Jamaican-spice-light. Sits at the modifier-and-flavor end of the grid, parallel to chili and pepper in usage.

Ruby
noun

From the Latin ruber — simply, red. The gemstone is a chromium-tinged corundum, harder than anything in nature except diamond, and so saturated that a fine Burmese pigeon's blood ruby at auction outpaces a comparable diamond by weight. The color borrows the gem's confidence: a clear, glassy red without the brown of garnet or the blue of crimson.

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.

#a51822
Original
#474021
Protanopia
#695e1c
Deuteranopia
#b6001e
Tritanopia
#373737
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).
AAAon White
7.63:1
The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
Failon Black
2.75:1

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
##A51822
Display P3
Display P3
color(display-p3 0.5936 0.1573 0.1587)
P3 has subtle headroomOKLCH chroma 0.174

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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