International Klein Blue

#0424C6

About International Klein Blue

International Klein Blue, often abbreviated as IKB, is a deep blue hue first mixed by the French artist Yves Klein. Klein patented IKB in 1957 to maintain the color's fidelity, as he believed that traditional paint mediums diminished the pigment's intensity. The unique matte finish of IKB paint enhances its vividness, giving the impression of pure color extending beyond the surface. Chemically, the color is a synthetic ultramarine pigment. IKB has become synonymous with Klein's artistic style and philosophy, symbolizing boundless imagination and spiritual depth. It is widely recognized and celebrated in the art world for its striking visual impact and its ability to evoke powerful emotional responses. Beyond art, IKB has influenced fashion, interior design, and graphic design, underscoring its enduring appeal and cultural significance.

The color #0424C6, also known as International Klein Blue (IKB), presents significant accessibility challenges, particularly in web design. Its dark hue results in a very low contrast ratio against standard light backgrounds, especially white. This makes text or UI elements using IKB difficult to read for users with visual impairments, including those with low vision or color blindness. To ensure accessibility, it is essential to use IKB sparingly and always pair it with very light or even white text to meet WCAG (Web Content Accessibility Guidelines) contrast requirements. A contrast ratio of at least 4.5:1 for normal text and 3:1 for large text is recommended. Considering alternative, more accessible color combinations is crucial for inclusive design, ensuring that content is usable by everyone, regardless of their visual abilities. Tools like contrast checkers can help verify compliance with accessibility standards, aiding in creating a more inclusive user experience.

Shades

Digital Color Formats

RGB
4 36 198
RGB4 36 198
Red
Green
Blue
HSL
230.1deg 96.04% 39.61%
230.196.0439.61HSL
Hue
Saturation
Lightness
HWB
230.1deg 1.57% 22.35%
230.11.5722.35HWB
Hue
Whiteness
Blackness
hex#0424C6
rgb4 36 198
hsl230.1deg 96.04% 39.61%
cmyk97.98% 81.82% 0% 22.35%
hwb230.1deg 1.57% 22.35%
xyz-d650.11 0.05 0.54
oklch0.4 0.2411 264.56
oklab0.4 -0.02 -0.24
CMYK
97.98% 81.82% 0% 22.35%
97.9881.82022.35CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.11 0.05 0.54
0.110.050.54XYZ
X
Y
Z
OKLCH
0.4 0.2411 264.56
0.40.2411264.56LCH
Lightness
Chroma
Hue
OKLAB
0.4 -0.02 -0.24
0.4-0.02-0.24LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

Buttons