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Charred Pater Cobalt

#1b3f87
Notes

Charred Pater Cobalt (#1B3F87) is a deep azure 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 (220°, 67%, 32%) 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
#1b3f87
RGB
rgb(27, 63, 135)
HSL
hsl(220, 67%, 32%)
HWB
hwb(220 11% 47%)
OKLCH
oklch(38.6% 0.128 262.2)
P3
color(display-p3 0.1421 0.2438 0.5110)
HSV
hsv(220, 80%, 53%)
LAB
lab(28.21% 14.96 -43.97)
LCH
lch(28.21% 46.45 288.78)
CMYK
cmyk(80%, 53%, 0%, 47%)

Etymology

Charred
adjective

The past participle of char, to burn slightly — and a color word for surfaces that have been heat-blackened without fully consuming. Charred implies the carbon-blackened skin of grilled meat, fired wood, or smoke-darkened cathedral stone. Sits in the deep-and-near-black end of the engine's grid, slightly drier than inky and warmer than somber.

Pater
modifier

Latin pater, father. As a color modifier, pater implies a Latin-father-and-paterfamilias-and-Pater-Noster quality, the visual register of Pater-Noster-and-Roman-paterfamilias hand-Latin-father-and-paterfamilias-and-Pater-Noster Pater-Noster-and-Roman-paterfamilias-and-Catholic-prayer pater-and-Latin-father surfaces under Pater-Noster-and-Roman-paterfamilias-and-Catholic-prayer Roman-Senate-and-Catholic-liturgy paterfamilias-light. Sits at the modifier-and-Latin end of the grid, parallel to mater and dux 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.

#1b3f87
Original
#0e488a
Protanopia
#003e86
Deuteranopia
#00505c
Tritanopia
#3d3d3d
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
9.96:1
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
2.11:1

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
##1B3F87
Display P3
Display P3
color(display-p3 0.1421 0.2438 0.5110)
P3 has subtle headroomOKLCH chroma 0.128

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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