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Robust Thor Ruby

#9c1004
Notes

Robust Thor Ruby (#9C1004) is a deep 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 (5°, 95%, 31%) places it in the highly saturated band at a dark 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
#9c1004
RGB
rgb(156, 16, 4)
HSL
hsl(5, 95%, 31%)
HWB
hwb(5 2% 39%)
OKLCH
oklch(44.1% 0.172 30.1)
HSV
hsv(5, 97%, 61%)
LAB
lab(32.81% 53.16 44.84)
LCH
lch(32.81% 69.55 40.15)
CMYK
cmyk(0%, 90%, 97%, 39%)

Etymology

Robust
adjective

From the Latin robustus, of oak — implying strength combined with substance. As a color modifier, robust describes saturation combined with body: a robust burgundy, a robust olive. Sits in the bold-and-warm corner alongside strong and solid, with the slightly textural implication of a color that has substance behind the pigment.

Thor
modifier

Old Norse Þórr, god-of-thunder-and-Mjölnir. As a color modifier, thor implies a hammer-Mjölnir-and-thunderbolt-and-red-bearded quality, the visual register of Norse-Thor-and-Mjölnir-hammer hand-hammer-Mjölnir-and-thunderbolt-and-red-bearded Norse-Thor-and-Mjölnir-hammer-and-Asgard thor-and-hammer-Mjölnir-and-thunderbolt surfaces under Norse-Thor-and-Mjölnir-hammer-and-Asgard Bilskirnir-and-Thrudheim-and-thunder-cart thunder-storm-light. Sits at the modifier-and-myth end of the grid, parallel to odin and loki 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.

#9c1004
Original
#433a00
Protanopia
#645800
Deuteranopia
#ad0011
Tritanopia
#2d2d2d
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
8.44:1
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
2.49:1

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