International Klein Blue

#012AB5

About International Klein Blue

International Klein Blue, often abbreviated as IKB, is a deep blue hue first mixed by the French artist Yves Klein. Klein patented this color in 1957. The vividness of IKB comes from its heavy reliance on ultramarine pigment, combined with a synthetic resin binder, which allows the pigment to maintain its brilliance and intensity. Unlike traditional paints where the binder can dull the pigment, IKB's formulation preserves the pigment's original color saturation. The color is particularly associated with Klein's monochrome paintings and sculptures, where he sought to evoke a sense of boundless space and spiritual depth. The unique quality of this blue has made it influential in art, fashion, and design.

The color #012AB5, also known as International Klein Blue, presents significant accessibility challenges. Its very dark hue results in a low contrast ratio against lighter backgrounds, potentially making text illegible for users with visual impairments. To ensure readability, especially for those with low vision or color blindness, it is crucial to use this color sparingly and pair it with very light foreground colors, such as white or light yellow. Adhering to WCAG (Web Content Accessibility Guidelines) contrast ratio requirements is essential when using this color in web design. Furthermore, avoid using this color as the sole indicator for interactive elements or important information, as users who cannot distinguish it from the background will miss crucial cues. Providing alternative visual cues, such as underlines or icons, can enhance accessibility.

Shades

Digital Color Formats

RGB
1 42 181
RGB1 42 181
Red
Green
Blue
HSL
226.33deg 98.9% 35.69%
226.3398.935.69HSL
Hue
Saturation
Lightness
HWB
226.33deg 0.39% 29.02%
226.330.3929.02HWB
Hue
Whiteness
Blackness
hex#012AB5
rgb1 42 181
hsl226.33deg 98.9% 35.69%
cmyk99.45% 76.8% 0% 29.02%
hwb226.33deg 0.39% 29.02%
xyz-d650.09 0.05 0.44
oklch0.3868 0.2172 263.98
oklab0.3868 -0.02 -0.22
CMYK
99.45% 76.8% 0% 29.02%
99.4576.8029.02CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.05 0.44
0.090.050.44XYZ
X
Y
Z
OKLCH
0.3868 0.2172 263.98
0.38680.2172263.98LCH
Lightness
Chroma
Hue
OKLAB
0.3868 -0.02 -0.22
0.3868-0.02-0.22LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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