International Klein Blue

#0431B0

About International Klein Blue

The color #0431B0, commonly referred to as International Klein Blue (IKB), is a deep, saturated blue hue. It was developed by the French artist Yves Klein in collaboration with a Parisian paint dealer, Edouard Adam, specifically for Klein's monochrome paintings. IKB's unique matte finish and intense saturation distinguish it from other blues, creating a visually arresting effect. Klein patented the color in 1957 to maintain its unique properties and ensure its exclusive use in his art. This vibrant blue has since become iconic, symbolizing artistic innovation and pushing the boundaries of color exploration.

The hex color #0431b0, also known as International Klein Blue, presents accessibility challenges due to its low luminance. When used as a foreground color, it requires careful consideration of the background color to ensure sufficient contrast for readability, especially for users with visual impairments. A contrast ratio of at least 4.5:1 is recommended for normal text and 3:1 for large text, as specified by WCAG guidelines. Combining this dark blue with light colors like white, yellow, or very light grays can improve legibility. Additionally, providing alternative text descriptions for images or graphical elements using this color is crucial for screen reader users. Developers should use color contrast analyzers to verify compliance with accessibility standards and make necessary adjustments to ensure inclusive design.

Shades

Digital Color Formats

RGB
4 49 176
RGB4 49 176
Red
Green
Blue
HSL
224.3deg 95.56% 35.29%
224.395.5635.29HSL
Hue
Saturation
Lightness
HWB
224.3deg 1.57% 30.98%
224.31.5730.98HWB
Hue
Whiteness
Blackness
hex#0431B0
rgb4 49 176
hsl224.3deg 95.56% 35.29%
cmyk97.73% 72.16% 0% 30.98%
hwb224.3deg 1.57% 30.98%
xyz-d650.09 0.05 0.42
oklch0.3925 0.2038 263.78
oklab0.3925 -0.02 -0.2
CMYK
97.73% 72.16% 0% 30.98%
97.7372.16030.98CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.05 0.42
0.090.050.42XYZ
X
Y
Z
OKLCH
0.3925 0.2038 263.78
0.39250.2038263.78LCH
Lightness
Chroma
Hue
OKLAB
0.3925 -0.02 -0.2
0.3925-0.02-0.2LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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