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Stalwart Thaw Crimson

#ad1e25
Notes

Stalwart Thaw Crimson (#AD1E25) 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
#ad1e25
RGB
rgb(173, 30, 37)
HSL
hsl(357, 70%, 40%)
HWB
hwb(357 12% 32%)
OKLCH
oklch(48.5% 0.177 25.0)
P3
color(display-p3 0.6230 0.1771 0.1716)
HSV
hsv(357, 83%, 68%)
LAB
lab(37.75% 55.63 34.20)
LCH
lch(37.75% 65.30 31.59)
CMYK
cmyk(0%, 83%, 79%, 32%)

Etymology

Stalwart
adjective

Old English stǣl-wyrðe, stable-and-worthy. As a color modifier, stalwart implies a saturated-and-loyal-and-firm quality where the hue carries the dependable-and-trustworthy visual presence of a Knight-Templar guard. Sits at the bold-and-firm end of the grid, parallel to steadfast and firm in usage.

Thaw
modifier

Old English thawian, to-melt-or-soften. As a color modifier, thaw implies a spring-melt-and-softening-frost quality, the visual register of English-spring-and-Pennine-thaw hand-spring-melt-and-softening-frost English-spring-and-Pennine-thaw-and-Cumbria-Highland-thaw thaw-and-spring-melt-and-softening-frost surfaces under English-spring-and-Pennine-thaw-and-Cumbria-Highland-thaw Yorkshire-Dales-and-Lake-District-and-Cairngorm spring-melt-light. Sits at the modifier-and-weather end of the grid, parallel to slush and rain 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.

#ad1e25
Original
#4d4523
Protanopia
#6f641f
Deuteranopia
#bf0023
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
7.03:1
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
2.99:1

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
##AD1E25
Display P3
Display P3
color(display-p3 0.6230 0.1771 0.1716)
P3 has subtle headroomOKLCH chroma 0.177

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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