International Klein Blue

#0418B0

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 and distinctive quality, ensuring its association with his artistic creations. Chemically, the color is achieved through a specific formulation of ultramarine pigment. It is renowned for its intense, almost velvety appearance, which Klein sought to capture the purest expression of blue. The color became a signature element in his monochromatic paintings and sculptures, symbolizing the infinite and the spiritual. It is not a naturally occuring pigment but a manufactured color for artists and designers. Its captivating effect lies in its ability to absorb light, creating a sense of depth and immersion.

The hex color #0418B0, also known as International Klein Blue, presents significant accessibility challenges, particularly in web design. Its very low luminance value of 0.017 means that it offers extremely poor contrast against standard white backgrounds. According to WCAG guidelines, sufficient contrast is crucial for users with visual impairments to perceive content effectively. To meet accessibility standards, text using #0418B0 should only be used with very light backgrounds or should be avoided altogether for large blocks of text. The color contrast ratio must be at least 4.5:1 for normal text and 3:1 for large text. Designers should use color contrast checkers to verify compliance and consider alternative, lighter shades of blue or pairing it with colors that provide sufficient contrast to ensure readability and usability for all users. It's recommended to test color combinations with real users, including those with visual impairments.

Shades

Digital Color Formats

RGB
4 24 176
RGB4 24 176
Red
Green
Blue
HSL
233.02 95.56% 35.29%
233.0295.5635.29HSL
Hue
Saturation
Lightness
HWB
233.02 1.57% 30.98%
233.021.5730.98HWB
Hue
Whiteness
Blackness
hex#0418B0
rgb4 24 176
hsl233.02 95.56% 35.29%
cmyk97.73% 86.36% 0% 30.98%
hwb233.02 1.57% 30.98%
xyz8.21 3.81 41.38
CMYK
97.73% 86.36% 0% 30.98%
97.7386.36030.98CMYK
Cyan
Magenta
Yellow
Key
XYZ
8.21 3.81 41.38
8.213.8141.38XYZ
X
Y
Z

Alternative colors

Applications

Complementary color

Buttons

HexColo.rs © 2025