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Buttressed Cast Crimson

#ac1e26
Notes

Buttressed Cast Crimson (#AC1E26) is a true red with a vibrant character. It holds its own as a focal accent, carrying visual weight without tipping into neon territory. Its HSL profile (357°, 70%, 40%) 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
#ac1e26
RGB
rgb(172, 30, 38)
HSL
hsl(357, 70%, 40%)
HWB
hwb(357 12% 33%)
OKLCH
oklch(48.3% 0.176 24.6)
P3
color(display-p3 0.6194 0.1765 0.1742)
HSV
hsv(357, 83%, 67%)
LAB
lab(37.56% 55.37 33.35)
LCH
lch(37.56% 64.64 31.06)
CMYK
cmyk(0%, 83%, 78%, 33%)

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.

Cast
modifier

Old Norse kasta, to-throw / to-mold. As a color modifier, cast implies a poured-metal-and-shaped quality, the visual register of foundry-cast-iron-and-bronze hand-poured-and-cooled iron-and-bronze-and-tin foundry-cast-and-shaped surfaces under foundry-cast-iron-and-bronze workshop-light. Sits at the modifier-and-texture end of the grid, parallel to forged and hewn in usage.

Crimson
noun

From the Old Spanish cremesin, itself from the Arabic qirmiz — the kermes scale insect, dried and ground into a brilliant carmine dye prized in the medieval Mediterranean. For centuries the most expensive red on a draper's shelf, reserved for cardinals, kings, and the cloth that gave English the word crimson. Cooler than scarlet, deeper than rose; the color of pomegranate seeds and a serious occasion.

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.

#ac1e26
Original
#4c4525
Protanopia
#6f6320
Deuteranopia
#be0023
Tritanopia
#3d3d3d
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
7.08:1
The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
Failon Black
2.97:1

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
##AC1E26
Display P3
Display P3
color(display-p3 0.6194 0.1765 0.1742)
P3 has subtle headroomOKLCH chroma 0.176

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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