International Klein Blue

#0333B1

About International Klein Blue

International Klein Blue, also known as IKB, is a deep blue hue first mixed by the French artist Yves Klein. Klein sought to create a blue that captured the vastness and intensity of the sky. In 1957, Klein patented this unique ultramarine blue, ensuring its exclusivity for his artistic endeavors. The color is renowned for its matte finish, which enhances its depth and vibrancy. It is achieved by suspending pure ultramarine pigment in a clear synthetic resin, retaining the pigment's original qualities. IKB has since become a symbol of modern art and has been used in various applications, from paintings and sculptures to fashion and design. The distinct shade remains a powerful expression of artistic vision and innovation, characterized by its unique matte texture and rich blue tone.

The hex color #0333B1, known as International Klein Blue, presents some accessibility challenges in web design. Its dark hue results in a low contrast ratio when paired with lighter text colors, which can make content difficult to read for users with visual impairments. According to WCAG guidelines, sufficient contrast is crucial for readability. Therefore, when using #0333B1 as a background, it's essential to use very light text colors, such as white (#FFFFFF), to ensure adequate contrast. Tools like contrast checkers can help verify compliance with accessibility standards. Additionally, avoid using this color for essential interactive elements without clear visual cues, as its low luminance might make it hard for users to distinguish interactive components. Consider providing alternative high-contrast themes for users with specific needs.

Shades

Digital Color Formats

RGB
3 51 177
RGB3 51 177
Red
Green
Blue
HSL
223.45deg 96.67% 35.29%
223.4596.6735.29HSL
Hue
Saturation
Lightness
HWB
223.45deg 1.18% 30.59%
223.451.1830.59HWB
Hue
Whiteness
Blackness
hex#0333B1
rgb3 51 177
hsl223.45deg 96.67% 35.29%
cmyk98.31% 71.19% 0% 30.59%
hwb223.45deg 1.18% 30.59%
xyz-d650.09 0.06 0.42
oklch0.3967 0.203 263.52
oklab0.3967 -0.02 -0.2
CMYK
98.31% 71.19% 0% 30.59%
98.3171.19030.59CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.06 0.42
0.090.060.42XYZ
X
Y
Z
OKLCH
0.3967 0.203 263.52
0.39670.203263.52LCH
Lightness
Chroma
Hue
OKLAB
0.3967 -0.02 -0.2
0.3967-0.02-0.2LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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