International Klein Blue

#0429B0

General Information about International Klein Blue

International Klein Blue (IKB), with the hex code #0429b0, is a deep shade of blue first mixed by the French artist Yves Klein. Klein registered this color as a trademark in 1957. IKB's visual impact comes from its heavy reliance on ultramarine pigment, as well as Klein's artistic vision. The color is intended to evoke a feeling of immersion and boundlessness, mirroring Klein's artistic explorations of the infinite. The color became famous during the 1960s, where it has a significant cultural impact. It appears in different forms of art, including paintings, sculptures and even fashion. It is a color associated with creativity, depth and modernity. Furthermore, the color can also be associated with luxury.

The hex color #0429b0, also known as International Klein Blue, presents significant accessibility challenges, particularly for users with visual impairments. Its very low luminance value (dark color) requires careful consideration of contrast ratios to ensure readability. When using this color for text or interactive elements, it's crucial to pair it with a very light color, ideally white or a very pale yellow, to achieve a contrast ratio that meets WCAG (Web Content Accessibility Guidelines) standards of at least 4.5:1 for normal text and 3:1 for large text. Failure to provide sufficient contrast can render content illegible for users with low vision. Avoid using this color for critical information or actions unless paired with a highly contrasting element. Moreover, relying solely on color to convey meaning is discouraged; supplement color cues with text labels or icons to accommodate users who are colorblind.

Shades

Digital Color Formats

RGB
4 41 176
RGB4 41 176
Red
Green
Blue
HSL
227.09deg 95.56% 35.29%
227.0995.5635.29HSL
Hue
Saturation
Lightness
HWB
227.09deg 1.57% 30.98%
227.091.5730.98HWB
Hue
Whiteness
Blackness
hex#0429B0
rgb4 41 176
hsl227.09deg 95.56% 35.29%
cmyk97.73% 76.7% 0% 30.98%
hwb227.09deg 1.57% 30.98%
xyz-d650.09 0.05 0.42
oklch0.3801 0.2118 264.32
oklab0.3801 -0.02 -0.21
CMYK
97.73% 76.7% 0% 30.98%
97.7376.7030.98CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.05 0.42
0.090.050.42XYZ
X
Y
Z
OKLCH
0.3801 0.2118 264.32
0.38010.2118264.32LCH
Lightness
Chroma
Hue
OKLAB
0.3801 -0.02 -0.21
0.3801-0.02-0.21LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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