International Klein Blue

#001BB6

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. The color's remarkable intensity and purity captivated Klein, who saw it as a representation of the boundless expanse of the sky and the limitless potential of the human imagination. Chemically, IKB is a matte version of ultramarine blue, achieved through a specific formula that suspends the pigment in a synthetic resin, preserving its luminosity and depth. Klein registered IKB as a trademark in 1957, solidifying its unique status in the art world. It is perceived as a transcendental representation of the void.

The hex color #001bb6, also known as International Klein Blue, presents considerable accessibility challenges, especially in web design. Its very dark hue results in low contrast against lighter backgrounds, making text and interactive elements difficult to read for users with visual impairments. To ensure inclusivity, it's crucial to use a light-colored text (white or very light shades of yellow or grey) on a background of this color. Adhering to WCAG (Web Content Accessibility Guidelines) standards is highly recommended. Aim for a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text. If used for interactive elements like buttons, provide clear visual cues beyond color alone, such as borders or text labels. Avoid using this color for crucial information without proper contrast to prevent excluding users with low vision or color blindness. Careful consideration of color combinations is vital for an accessible user experience.

Shades

Digital Color Formats

RGB
0 27 182
RGB0 27 182
Red
Green
Blue
HSL
231.1deg 100% 35.69%
231.110035.69HSL
Hue
Saturation
Lightness
HWB
231.1deg 0% 28.63%
231.1028.63HWB
Hue
Whiteness
Blackness
hex#001BB6
rgb0 27 182
hsl231.1deg 100% 35.69%
cmyk100% 85.16% 0% 28.63%
hwb231.1deg 0% 28.63%
xyz-d650.09 0.04 0.45
oklch0.3693 0.2307 264.22
oklab0.3693 -0.02 -0.23
CMYK
100% 85.16% 0% 28.63%
10085.16028.63CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.04 0.45
0.090.040.45XYZ
X
Y
Z
OKLCH
0.3693 0.2307 264.22
0.36930.2307264.22LCH
Lightness
Chroma
Hue
OKLAB
0.3693 -0.02 -0.23
0.3693-0.02-0.23LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

Buttons