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Brimming Shade Ruby

#a21129
Notes

Brimming Shade Ruby (#A21129) 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 (350°, 81%, 35%) 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 teal. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#a21129
RGB
rgb(162, 17, 41)
HSL
hsl(350, 81%, 35%)
HWB
hwb(350 7% 36%)
OKLCH
oklch(45.7% 0.174 20.9)
HSV
hsv(350, 90%, 64%)
LAB
lab(34.49% 55.57 27.51)
LCH
lch(34.49% 62.00 26.34)
CMYK
cmyk(0%, 90%, 75%, 36%)

Etymology

Brimming
adjective

Old English brymme, brim / edge — present-participle of brim. As a color modifier, brimming implies a saturated-and-overflowing quality where the hue spills past the edge of its visual container with rich pigmentation. Sits at the bold-and-saturated end of the grid, parallel to replete and abundant.

Shade
modifier

Old English sceadu, shadow-or-shelter. As a color modifier, shade implies a sheltered-and-cool-and-shadowed quality, the visual register of Tuscan-cypress-and-Provençal-plane-tree-shade hand-sheltered-and-cool-and-shadowed Tuscan-cypress-and-Provençal-plane-tree-and-English-yew shaded-and-sheltered-and-cool surfaces under Tuscan-cypress-and-Provençal-plane-tree-and-English-yew dappled-and-cool-and-filtered afternoon-light. Sits at the modifier-and-mood end of the grid, parallel to shadow and gloam 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.

#a21129
Original
#433e28
Protanopia
#665c24
Deuteranopia
#b3001d
Tritanopia
#323232
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
7.93:1
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
2.65:1

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