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Royal Orion Ruby

#910518
Notes

Royal Orion Ruby (#910518) 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 (352°, 93%, 29%) 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
#910518
RGB
rgb(145, 5, 24)
HSL
hsl(352, 93%, 29%)
HWB
hwb(352 2% 43%)
OKLCH
oklch(41.6% 0.165 24.3)
P3
color(display-p3 0.5201 0.1053 0.1192)
HSV
hsv(352, 97%, 57%)
LAB
lab(29.90% 52.26 31.92)
LCH
lch(29.90% 61.24 31.41)
CMYK
cmyk(0%, 97%, 83%, 43%)

Etymology

Royal
noun

The blue of European royal court dress and regalia from the late seventeenth century forward — the color of British peers' robes, French royal sashes, the lining of the crown-jewel cases. The color refers to a saturated, slightly violet-shifted blue with the matte finish of velvet or melton wool dyed to maximum intensity: deeper than cornflower, warmer than ultramarine, with the heraldic weight of a color reserved for monarchs and the official Crown.

Orion
modifier

Greek Ὠρίων, hunter-of-the-myth. As a color modifier, orion implies a winter-hunter-and-belt-and-shoulder quality, the visual register of winter-Orion-and-Belt-of-Orion hand-winter-hunter-and-belt-and-shoulder winter-Orion-and-Belt-of-Orion-and-Bortle-1-sky orion-and-winter-hunter-and-belt-and-shoulder surfaces under winter-Orion-and-Belt-of-Orion-and-Bortle-1-sky January-and-February-winter-zenith winter-constellation-light. Sits at the modifier-and-cosmic end of the grid, parallel to rigel and cygnus 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.

#910518
Original
#3a3417
Protanopia
#5a5011
Deuteranopia
#a00010
Tritanopia
#242424
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
9.38:1
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
2.24:1

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
##910518
Display P3
Display P3
color(display-p3 0.5201 0.1053 0.1192)
P3 has subtle headroomOKLCH chroma 0.165

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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