International Klein Blue

#042DB0

About International Klein Blue

The hex color #042DB0, also known as International Klein Blue (IKB), is a deep and vibrant shade of blue. It was developed by the French artist Yves Klein in collaboration with a Parisian paint dealer, Edouard Adam, specifically for Klein's monochromatic paintings. The color's intense saturation is achieved by suspending pure color pigment in a synthetic resin, which retains the pigment's brilliance. IKB is not just a color; it's a statement, a visual representation of the infinite and the immaterial, as Klein intended. It has a captivating and almost hypnotic quality, drawing viewers into its depths. Its unique and impactful nature has made it iconic in the art world and beyond.

The hex color #042DB0, a deep, saturated blue, presents significant accessibility challenges, particularly when used for text or interactive elements. Its low luminance (brightness) creates insufficient contrast against common background colors like white or light gray, making it difficult for users with visual impairments, including those with low vision or color blindness, to discern text or interactive elements effectively. To ensure accessibility, it's crucial to pair this color with very light or bright colors that offer a high contrast ratio, ideally meeting or exceeding WCAG (Web Content Accessibility Guidelines) AA or AAA standards. A contrast checker tool can help verify compliance. Avoid using this color for critical information or calls to action without proper contrast, as it could exclude a significant portion of your audience. Consider using it sparingly for decorative elements or backgrounds where contrast is less critical.

Shades

Digital Color Formats

RGB
4 45 176
RGB4 45 176
Red
Green
Blue
HSL
225.7deg 95.56% 35.29%
225.795.5635.29HSL
Hue
Saturation
Lightness
HWB
225.7deg 1.57% 30.98%
225.71.5730.98HWB
Hue
Whiteness
Blackness
hex#042DB0
rgb4 45 176
hsl225.7deg 95.56% 35.29%
cmyk97.73% 74.43% 0% 30.98%
hwb225.7deg 1.57% 30.98%
xyz-d650.09 0.05 0.42
oklch0.3861 0.2079 264.08
oklab0.3861 -0.02 -0.21
CMYK
97.73% 74.43% 0% 30.98%
97.7374.43030.98CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.05 0.42
0.090.050.42XYZ
X
Y
Z
OKLCH
0.3861 0.2079 264.08
0.38610.2079264.08LCH
Lightness
Chroma
Hue
OKLAB
0.3861 -0.02 -0.21
0.3861-0.02-0.21LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

Buttons