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Befittingly Umbra

#21050d
Notes

Befittingly Umbra (#21050D) 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 (343°, 74%, 7%) places it in the balanced band at a dark lightness. It works well as a headline, icon, or deep background in an otherwise light layout, pairing cleanly with cream, bone, and warm neutrals. 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
#21050d
RGB
rgb(33, 5, 13)
HSL
hsl(343, 74%, 7%)
HWB
hwb(343 2% 87%)
OKLCH
oklch(17.3% 0.051 5.1)
P3
color(display-p3 0.1165 0.0255 0.0511)
HSV
hsv(343, 85%, 13%)
LAB
lab(4.16% 12.94 1.03)
LCH
lch(4.16% 12.98 4.55)
CMYK
cmyk(0%, 85%, 61%, 87%)

Etymology

Befittingly
adjective

Old English be- plus fit — adverbial-and-adjectival suffix -ly. As a color modifier, befittingly implies a neutral-and-suitable-and-context-fitting quality where the hue carries the visual register of well-suited-and-appropriately-fitting coordinated color-decision. Sits at the neutral-and-traditional end of the grid, parallel to appropriately and suitably in usage.

Umbra
noun

Latin umbra, shadow — adopted into astronomy as the technical term for the deep-shadow inner cone of an eclipse shadow, where the occulting body completely blocks the light source. Umbra color refers to a total solar eclipse ground-level observer's path of totality darkness: a saturated, slightly cool deep black with the optical complexity of total-solar-eclipse atmospheric scattering against a shadow-cone-occluded sun-disk.

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.

#21050d
Original
#0a0b0d
Protanopia
#12110c
Deuteranopia
#250308
Tritanopia
#0c0c0c
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
19.23:1
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
1.09:1

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
##21050D
Display P3
Display P3
color(display-p3 0.1165 0.0255 0.0511)
Inside sRGBOKLCH chroma 0.051

This color sits well within the sRGB cube. P3 and sRGB share the gray axis and most desaturated tones, so a P3 display renders this identically to an sRGB display.

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