International Klein Blue

#0021C2

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 unique matte appearance is achieved through a specific formula involving a synthetic resin binder, which preserves the pigment's intensity. Klein registered this color as a trademark in 1957, cementing its place in art history. The intense saturation of IKB is due to its high reflectance of blue wavelengths, creating a powerful visual impact. The color is not only visually striking but also holds symbolic significance, often associated with boundless space, the immaterial, and the infinite. Klein sought to capture the essence of the sky and sea in this pigment, aiming to evoke a sense of awe and transcendence. Its unique properties make it a captivating shade used in various artistic and design applications.

International Klein Blue (#0021C2) presents considerable accessibility challenges, primarily due to its deep hue and low luminance. When used as a foreground color, it requires careful consideration of the background to ensure sufficient contrast. According to WCAG guidelines, the contrast ratio between foreground and background colors should be at least 4.5:1 for normal text and 3:1 for large text to meet AA compliance. Given its darkness, using #0021C2 for text on a white or light-colored background may not meet these ratios, making it difficult for users with visual impairments to read. To enhance accessibility, it is advisable to pair it with a very light color such as white (#FFFFFF) or a pale yellow. Moreover, providing alternative cues, like icons or labels, can aid users who struggle with color perception. Designers should evaluate the color's impact on users with color blindness using simulations to ensure that critical information is not lost. Thoughtful application, including adjusting text size or weight, can somewhat mitigate these issues, but careful pairing remains paramount.

Shades

Digital Color Formats

RGB
0 33 194
RGB0 33 194
Red
Green
Blue
HSL
229.79deg 100% 38.04%
229.7910038.04HSL
Hue
Saturation
Lightness
HWB
229.79deg 0% 23.92%
229.79023.92HWB
Hue
Whiteness
Blackness
hex#0021C2
rgb0 33 194
hsl229.79deg 100% 38.04%
cmyk100% 82.99% 0% 23.92%
hwb229.79deg 0% 23.92%
xyz-d650.1 0.05 0.51
oklch0.391 0.2395 264.19
oklab0.391 -0.02 -0.24
CMYK
100% 82.99% 0% 23.92%
10082.99023.92CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.1 0.05 0.51
0.10.050.51XYZ
X
Y
Z
OKLCH
0.391 0.2395 264.19
0.3910.2395264.19LCH
Lightness
Chroma
Hue
OKLAB
0.391 -0.02 -0.24
0.391-0.02-0.24LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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