International Klein Blue

#0415B0

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, ensuring that its specific formulation remained exclusive to him. The color is renowned for its striking intensity and purity, achieved through the use of a matte, synthetic resin binder that allows the pigment to retain its brilliance. Chemically, IKB is based on ultramarine pigment, but its specific mixing process and the binder contribute to its distinct visual impact. It is not just a color but an artistic statement, deeply intertwined with Klein's exploration of infinite space and spirituality. Its distinctive quality makes it very popular in modern fashion, interior designs and fine arts.

The hex color #0415B0, also known as International Klein Blue, presents some accessibility challenges, particularly in web design. Its dark hue results in low contrast when paired with lighter shades, potentially making text difficult to read for users with visual impairments. According to WCAG guidelines, sufficient contrast is crucial for readability. When using this color for backgrounds, ensure that the foreground text is a light color, such as white or a very light gray, and meets the contrast ratio requirements (4.5:1 for normal text and 3:1 for large text). Tools like contrast checkers can help verify compliance. Additionally, avoid using this color as the sole indicator for interactive elements, as colorblind users may not perceive the difference. Supplement color cues with text labels or icons to ensure inclusivity and usability for all users.

Shades

Digital Color Formats

RGB
4 21 176
RGB4 21 176
Red
Green
Blue
HSL
234.07 95.56% 35.29%
234.0795.5635.29HSL
Hue
Saturation
Lightness
HWB
234.07 1.57% 30.98%
234.071.5730.98HWB
Hue
Whiteness
Blackness
hex#0415B0
rgb4 21 176
hsl234.07 95.56% 35.29%
cmyk97.73% 88.07% 0% 30.98%
hwb234.07 1.57% 30.98%
xyz8.15 3.7 41.36
CMYK
97.73% 88.07% 0% 30.98%
97.7388.07030.98CMYK
Cyan
Magenta
Yellow
Key
XYZ
8.15 3.7 41.36
8.153.741.36XYZ
X
Y
Z

Alternative colors

Applications

Complementary color

Buttons

HexColo.rs © 2025