International Klein Blue

#0137B3

About International Klein Blue

International Klein Blue, often abbreviated as IKB, is a deep blue hue first mixed by the French artist Yves Klein. The color's visual impact comes from its heavy reliance on ultramarine, as well as Klein's patent for maintaining the color's brilliance when suspended in synthetic resin. IKB is a vivid and highly saturated shade of blue that is instantly recognizable. It’s not just a color, but a statement and artistic declaration. The hue falls within the range of blue-violet on the color spectrum. Its unique formulation and cultural significance have made it a distinctive and influential color in the art world and beyond, lending itself to various applications across design and fashion.

The hex color #0137B3, also known as International Klein Blue, presents some accessibility challenges, particularly in web design. Its dark hue means that careful consideration must be given to the foreground text color used against it. To ensure readability and compliance with accessibility standards such as WCAG (Web Content Accessibility Guidelines), it's crucial to use light text colors like white or very light grays. The contrast ratio between the text and background must meet a minimum threshold, typically 4.5:1 for normal text and 3:1 for large text (14pt bold or 18pt regular). Tools like contrast checkers can help verify compliance. Avoid using this color with similarly dark or muted text colors, as this can render the content unreadable for users with visual impairments. Thoughtful color choices can significantly improve the user experience.

Shades

Digital Color Formats

RGB
1 55 179
RGB1 55 179
Red
Green
Blue
HSL
221.8deg 98.89% 35.29%
221.898.8935.29HSL
Hue
Saturation
Lightness
HWB
221.8deg 0.39% 29.8%
221.80.3929.8HWB
Hue
Whiteness
Blackness
hex#0137B3
rgb1 55 179
hsl221.8deg 98.89% 35.29%
cmyk99.44% 69.27% 0% 29.8%
hwb221.8deg 0.39% 29.8%
xyz-d650.1 0.06 0.43
oklch0.4054 0.2013 262.98
oklab0.4054 -0.02 -0.2
CMYK
99.44% 69.27% 0% 29.8%
99.4469.27029.8CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.1 0.06 0.43
0.10.060.43XYZ
X
Y
Z
OKLCH
0.4054 0.2013 262.98
0.40540.2013262.98LCH
Lightness
Chroma
Hue
OKLAB
0.4054 -0.02 -0.2
0.4054-0.02-0.2LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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