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Sinewy Hull Crimson

#d21717
Notes

Sinewy Hull Crimson (#D21717) 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 (0°, 80%, 46%) 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 cyan. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#d21717
RGB
rgb(210, 23, 23)
HSL
hsl(0, 80%, 46%)
HWB
hwb(0 9% 18%)
OKLCH
oklch(55.0% 0.215 28.2)
HSV
hsv(0, 89%, 82%)
LAB
lab(44.77% 66.90 50.62)
LCH
lch(44.77% 83.89 37.11)
CMYK
cmyk(0%, 89%, 89%, 18%)

Etymology

Sinewy
adjective

Old English sinu, sinew — adjectival suffix -y. As a color modifier, sinewy implies a saturated-and-muscular-and-firm quality where the hue carries the lean-and-strong visual presence of a Roman-statue athletic figure. Sits at the bold-and-firm end of the grid, parallel to stalwart and rugged in usage.

Hull
modifier

Old English hulu, husk / shell. As a color modifier, hull implies a ship's-body-and-skin quality, the visual register of Royal-Navy-and-merchant-marine-hull hand-laid clinker-and-carvel-built timber-and-iron-and-steel ship's-hull-and-skin maritime-architecture surfaces under ship-hull-and-waterline maritime-and-dry-dock light. Sits at the modifier-and-nautical end of the grid, parallel to keel and prow 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.

#d21717
Original
#5b5112
Protanopia
#877803
Deuteranopia
#e8001c
Tritanopia
#3f3f3f
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).
AAon White
5.42:1
The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
AA Largeon Black
3.88:1

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