International Klein Blue

#0617A6

About International Klein Blue

International Klein Blue, often referred to as IKB, is a deep blue hue first mixed by the French artist Yves Klein. It's renowned for its vivid and almost ethereal quality, resulting from Klein's collaboration with a Parisian paint supplier to suspend pure ultramarine pigment in a clear synthetic resin. This unique process maintains the pigment's intensity and brilliance, setting it apart from conventional blue paints. Klein registered IKB as a trademark in 1957, solidifying its status as a distinctive color synonymous with his artistic vision. The color has since been widely adopted in various fields, including art, fashion, and design, prized for its captivating and distinctive character.

The hex color #0617A6, also known as International Klein Blue, presents significant accessibility challenges, particularly in web design. Its very low luminance value of 0.008 makes it difficult to achieve sufficient contrast with lighter text or interface elements. According to WCAG guidelines, a contrast ratio of at least 4.5:1 is recommended for normal text and 3:1 for large text. Using #0617A6 as a background color requires extremely light text to meet these standards, potentially limiting font choices and visual appeal. Therefore, designers should exercise caution and thoroughly test the color combination with accessibility tools to ensure readability for users with visual impairments. Alternatives include using lighter shades of blue or complementary colors with higher luminance to ensure content is accessible to a wider audience.

Shades

Digital Color Formats

RGB
6 23 166
RGB6 23 166
Red
Green
Blue
HSL
233.63deg 93.02% 33.73%
233.6393.0233.73HSL
Hue
Saturation
Lightness
HWB
233.63deg 2.35% 34.9%
233.632.3534.9HWB
Hue
Whiteness
Blackness
hex#0617A6
rgb6 23 166
hsl233.63deg 93.02% 33.73%
cmyk96.39% 86.14% 0% 34.9%
hwb233.63deg 2.35% 34.9%
xyz-d650.07 0.03 0.36
oklch0.3457 0.2149 265.13
oklab0.3457 -0.02 -0.21
CMYK
96.39% 86.14% 0% 34.9%
96.3986.14034.9CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.07 0.03 0.36
0.070.030.36XYZ
X
Y
Z
OKLCH
0.3457 0.2149 265.13
0.34570.2149265.13LCH
Lightness
Chroma
Hue
OKLAB
0.3457 -0.02 -0.21
0.3457-0.02-0.21LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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