When Dull Carbon until Expiring

#15175e RGB(21,23,94)

About this color

When Dull Carbon until Expiring settles into a dark blue territory with a vivid quality that feels cool — captured at #15175e, RGB(21, 23, 94).

#15175eRGB(21, 23, 94)

HSL 238° · 63% saturation · 23% lightness

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Psychology

In its darkest registers blue becomes serious and introspective: trustworthy, professional, slightly austere.

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History

The ancient Egyptians were among the first to produce blue pigment artificially — Egyptian blue, made from copper and sand, coloured the walls of pharaonic tombs.

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Design use

From a design perspective, this shade excels as a background for light-coloured text, as a deep accent stripe, or as an anchoring tone in dark-mode interfaces. It pairs naturally with off-whites, warm creams, and metallic highlights.

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Colour pairings

Looking at colour relationships, this blue pairs naturally with warm neutrals — tawny beiges, soft terracottas, aged brass — which amplify its cool character by contrast. Analogous blue-violets and blue-greens give a more cohesive, tonal result.

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Color Categories

Color formats

Name
When Dull Carbon until Expiring
HEX
#15175e
RGB
rgb(21,23,94)
RGB%
rgb(8.2%,9%,36.9%)
HSL
hsl(238,63%,23%)
HSV
hsv(238,78%,37%)
CMYK
cmyk(78,76,0,63)
LAB
lab(13,26,-42)
LCH
lch(13,49,302)
sRGB
(0.082,0.09,0.369)
HEX8
#15175eff
CSS Name
Decimal
021023094

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Color variants

Color info

Lightness
23%
Saturation
63%
Hue
238°
Chroma
49
Temperature
WarmCool
Contrast Preview
The quick brown fox jumps over the lazy dog

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