International Klein Blue

#001EB4

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 in 1957. What sets IKB apart is its unique ultramarine pigment, which provides an intense saturation and velvety matte finish. This color is not just a shade of blue; it's a statement, known for its ability to evoke feelings of depth, spirituality, and boundlessness. In the art world, IKB became synonymous with Klein's work, particularly his monochrome paintings. Its mesmerizing quality draws viewers into a world of pure color and emotion. This color is very popular because it is often used to convey a feeling of trust and safety.

The hex color #001EB4, also known as International Klein Blue, presents significant accessibility challenges, especially in web design. Its deep, saturated hue results in very low contrast when paired with lighter text or interface elements. According to WCAG guidelines, sufficient contrast is crucial for users with visual impairments to perceive content effectively. A contrast ratio of at least 4.5:1 is recommended for normal text and 3:1 for large text. Given the darkness of #001EB4, light text on this background is unlikely to meet these standards. To improve accessibility, consider using a much lighter color, such as white or a pale yellow, for text. Also, the text size should be considerd to improve the legibility. Using online contrast checkers is highly recommended to ensure compliance with accessibility standards and to provide a better experience for all users.

Shades

Digital Color Formats

RGB
0 30 180
RGB0 30 180
Red
Green
Blue
HSL
230 100% 35.29%
23010035.29HSL
Hue
Saturation
Lightness
HWB
230 0% 29.41%
230029.41HWB
Hue
Whiteness
Blackness
hex#001EB4
rgb0 30 180
hsl230 100% 35.29%
cmyk100% 83.33% 0% 29.41%
hwb230 0% 29.41%
xyz8.7 4.22 43.54
CMYK
100% 83.33% 0% 29.41%
10083.33029.41CMYK
Cyan
Magenta
Yellow
Key
XYZ
8.7 4.22 43.54
8.74.2243.54XYZ
X
Y
Z

Alternative colors

Applications

Complementary color

Buttons

HexColo.rs © 2025