Ultramarine

#0B1591

General Information about Ultramarine

Ultramarine, represented by the hex code #0B1591, is a deep, rich blue color. It is named after the pigment derived from lapis lazuli, a semi-precious stone, which was historically ground and processed to create the vibrant blue hue used by artists. Because of the laborious process, the pigment was incredibly expensive, making it a color reserved for painting important figures such as Jesus or the Virgin Mary. In modern times, ultramarine is synthetically produced, making it readily available for various applications. In the RGB color model, #0B1591 consists of 4.3% red, 8.2% green, and 56.9% blue. It falls within the blue color family and conveys feelings of stability, trust, and authority. The color is often associated with royalty, intelligence, and the ocean.

The color #0B1591, a deep ultramarine, presents significant accessibility challenges. Its extremely low lightness value of approximately 4% means it offers very poor contrast against white text or backgrounds. This fails WCAG (Web Content Accessibility Guidelines) standards for normal text (AA) and even large text (AA). Using this color for text or important UI elements against a light background would make content extremely difficult, if not impossible, for many users to read, especially those with visual impairments. To improve accessibility, pair it with very light colors like white (#FFFFFF) or very light grays, but always check contrast ratios. Consider using this color sparingly for decorative elements where legibility is not critical, or use a different color altogether.

Shades

Digital Color Formats

RGB
11 21 145
RGB11 21 145
Red
Green
Blue
HSL
235.52deg 85.9% 30.59%
235.5285.930.59HSL
Hue
Saturation
Lightness
HWB
235.52deg 4.31% 43.14%
235.524.3143.14HWB
Hue
Whiteness
Blackness
hex#0B1591
rgb11 21 145
hsl235.52deg 85.9% 30.59%
cmyk92.41% 85.52% 0% 43.14%
hwb235.52deg 4.31% 43.14%
xyz-d650.06 0.03 0.27
oklch0.3174 0.1917 266.38
oklab0.3174 -0.01 -0.19
CMYK
92.41% 85.52% 0% 43.14%
92.4185.52043.14CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.06 0.03 0.27
0.060.030.27XYZ
X
Y
Z
OKLCH
0.3174 0.1917 266.38
0.31740.1917266.38LCH
Lightness
Chroma
Hue
OKLAB
0.3174 -0.01 -0.19
0.3174-0.01-0.19LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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