International Klein Blue

#0B37A9

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 registered this color as a trademark in 1957. IKB's visual impact comes from its heavy reliance on ultramarine pigment, combined with a synthetic resin binder, which allows the pigment to maintain its brilliance. The color is particularly known for its matte finish, which enhances its saturation and depth, making it appear almost velvety. Klein used IKB in his monochromatic paintings and sculptures to evoke a sense of boundlessness and spirituality, aiming to remove any representational or emotional distractions from the viewer's experience.

The hex color #0B37A9, also known as International Klein Blue, presents some accessibility challenges, especially in web design. Its dark hue means that text displayed in this color requires a light background to ensure sufficient contrast. A contrast ratio of at least 4.5:1 is recommended for normal-sized text and 3:1 for large text (14pt bold or 18pt regular) to meet WCAG AA standards. When using this color for interactive elements like buttons or links, it's important to provide clear visual cues, such as a change in background color or the addition of an underline, to indicate their interactive state. Proper color contrast enhances readability and ensures that users with visual impairments can easily perceive and interact with the content.

Shades

Digital Color Formats

RGB
11 55 169
RGB11 55 169
Red
Green
Blue
HSL
223.29deg 87.78% 35.29%
223.2987.7835.29HSL
Hue
Saturation
Lightness
HWB
223.29deg 4.31% 33.73%
223.294.3133.73HWB
Hue
Whiteness
Blackness
hex#0B37A9
rgb11 55 169
hsl223.29deg 87.78% 35.29%
cmyk93.49% 67.46% 0% 33.73%
hwb223.29deg 4.31% 33.73%
xyz-d650.09 0.06 0.38
oklch0.3967 0.1874 263.7
oklab0.3967 -0.02 -0.19
CMYK
93.49% 67.46% 0% 33.73%
93.4967.46033.73CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.06 0.38
0.090.060.38XYZ
X
Y
Z
OKLCH
0.3967 0.1874 263.7
0.39670.1874263.7LCH
Lightness
Chroma
Hue
OKLAB
0.3967 -0.02 -0.19
0.3967-0.02-0.19LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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