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Fortified Moot Ruby

#91081e
Notes

Fortified Moot Ruby (#91081E) 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 (350°, 90%, 30%) 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 teal. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#91081e
RGB
rgb(145, 8, 30)
HSL
hsl(350, 90%, 30%)
HWB
hwb(350 3% 43%)
OKLCH
oklch(41.8% 0.164 22.5)
HSV
hsv(350, 94%, 57%)
LAB
lab(30.13% 51.99 28.49)
LCH
lch(30.13% 59.29 28.72)
CMYK
cmyk(0%, 94%, 79%, 43%)

Etymology

Fortified
adjective

Latin fortificāre, to make strong — past-participle of fortify. As a color modifier, fortified implies a saturated-and-strengthened-and-defensive quality, the deep-rich color of Vauban-style military-fortification stone-and-earth rampart-and-bastion architecture. Sits at the bold-and-fortified end of the grid, parallel to bastioned and armored.

Moot
modifier

Old English mōt, meeting-or-debate-point. As a color modifier, moot implies a debated-and-suspended-and-undecided quality, the visual register of Anglo-Saxon-witenagemot-and-Inns-of-Court-moot hand-argued-and-suspended Anglo-Saxon-witenagemot-and-medieval-moot-court witenagemot-and-Inns-of-Court-and-shire-court mooted-and-debated surfaces under Anglo-Saxon-witenagemot-and-Inns-of-Court oak-bench-and-vellum debate-hall-light. Sits at the modifier-and-mood end of the grid, parallel to void and blank 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.

#91081e
Original
#3a351d
Protanopia
#5a5118
Deuteranopia
#a00014
Tritanopia
#272727
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
9.30:1
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
2.26:1

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