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Entombed Smock Cobalt

#1b3073
Notes

Entombed Smock Cobalt (#1B3073) is a deep blue 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 (226°, 62%, 28%) 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 amber. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#1b3073
RGB
rgb(27, 48, 115)
HSL
hsl(226, 62%, 28%)
HWB
hwb(226 11% 55%)
OKLCH
oklch(33.6% 0.118 266.7)
P3
color(display-p3 0.1245 0.1861 0.4346)
HSV
hsv(226, 77%, 45%)
LAB
lab(22.25% 17.39 -41.04)
LCH
lch(22.25% 44.57 292.96)
CMYK
cmyk(77%, 58%, 0%, 55%)

Etymology

Entombed
adjective

Old French en-tombe, into-the-tomb — past-participle of entomb. As a color modifier, entombed implies the deep, sealed, untouched-by-light darkness of a sepulchre interior of medieval-and-Renaissance European cathedral architecture. Sits at the deep-and-funereal end of the grid, parallel to sepulchral and crypted in usage.

Smock
modifier

Old English smoc, loose-shift-or-shepherd's-smock. As a color modifier, smock implies a shepherd's-smock-and-artist's-smock-and-pleated quality, the visual register of English-shepherd's-smock-and-artist's-smock hand-shepherd's-smock-and-artist's-smock-and-pleated English-shepherd's-smock-and-artist's-smock-and-Sussex-Surrey-rural smock-and-shepherd's-smock surfaces under English-shepherd's-smock-and-artist's-smock-and-Sussex-Surrey-rural Sussex-Downs-and-Surrey-village shepherd-and-painter-light. Sits at the modifier-and-textile end of the grid, parallel to frock and tunic in usage.

Cobalt
noun

Element Co, atomic number 27 — German Kobold, goblin, named by miners who found the metal interfered with smelting silver ore. Cobalt blue is the cobalt-aluminate pigment introduced by Louis Jacques Thénard in 1802: a saturated, slightly green-shifted deep blue with the matte finish of mineral pigment in oil. Cooler than ultramarine, warmer than prussian, with the painter's weight of a pigment used by Renoir, Van Gogh, and Cézanne.

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.

#1b3073
Original
#003975
Protanopia
#003172
Deuteranopia
#00404c
Tritanopia
#303030
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
12.23:1
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
1.72:1

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
##1B3073
Display P3
Display P3
color(display-p3 0.1245 0.1861 0.4346)
P3 has subtle headroomOKLCH chroma 0.118

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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