International Klein Blue

#042EB0

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 this color to maintain its unique identity and association with his artistic creations. IKB's intense saturation sets it apart from other blues, making it easily recognizable. It's achieved through a specific combination of ultramarine pigment and a synthetic resin binder, which preserves the pigment's brilliance. The color has been used extensively in modern art, design, and fashion to evoke feelings of depth, spirituality, and the infinite. It is often seen as a representation of the immaterial and the boundless, and its widespread use continues to inspire artists and designers.

The color #042EB0, also known as International Klein Blue, presents significant accessibility challenges, especially in web design. Its very dark hue means it offers extremely low contrast when paired with similarly dark colors, rendering text or interactive elements nearly invisible. When used as a background, readability plummets for text that isn't a very light color. According to WCAG guidelines, which set standards for web accessibility, sufficient contrast between foreground and background colors is crucial for users with visual impairments. To ensure accessibility, pair this deep blue with very light colors like white (#FFFFFF) or a light yellow (#FFFFE0). Tools like contrast checkers can help verify if the contrast ratio meets accessibility standards, typically 4.5:1 for normal text and 3:1 for large text.

Shades

Digital Color Formats

RGB
4 46 176
RGB4 46 176
Red
Green
Blue
HSL
225.35deg 95.56% 35.29%
225.3595.5635.29HSL
Hue
Saturation
Lightness
HWB
225.35deg 1.57% 30.98%
225.351.5730.98HWB
Hue
Whiteness
Blackness
hex#042EB0
rgb4 46 176
hsl225.35deg 95.56% 35.29%
cmyk97.73% 73.86% 0% 30.98%
hwb225.35deg 1.57% 30.98%
xyz-d650.09 0.05 0.42
oklch0.3877 0.2069 264.02
oklab0.3877 -0.02 -0.21
CMYK
97.73% 73.86% 0% 30.98%
97.7373.86030.98CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.05 0.42
0.090.050.42XYZ
X
Y
Z
OKLCH
0.3877 0.2069 264.02
0.38770.2069264.02LCH
Lightness
Chroma
Hue
OKLAB
0.3877 -0.02 -0.21
0.3877-0.02-0.21LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

Buttons