International Klein Blue

#0435B0

About International Klein Blue

International Klein Blue, often referred to as IKB, is a deep blue hue that was developed by the French artist Yves Klein. It is renowned for its vivid and intense quality, stemming from Klein's desire to capture the purest expression of blue. He collaborated with a chemist to create a unique matte, synthetic resin binder that allowed the pigment to maintain its brilliance without losing its intensity. The color was officially patented as International Klein Blue in 1957. IKB is often associated with concepts of spirituality, the infinite, and the immaterial, reflecting Klein's artistic vision and philosophical beliefs. It has since become an iconic color in the art world and beyond.

The hex color #0435b0, also known as International Klein Blue, presents significant accessibility challenges, particularly in web design. Its very dark hue means that it requires extremely light text (ideally white or near-white) to ensure sufficient contrast for readability. According to WCAG guidelines, a contrast ratio of at least 4.5:1 is recommended for standard text and 3:1 for large text. Using #0435b0 for backgrounds or elements with dark text can make content inaccessible to users with visual impairments, including those with low vision or color blindness. Tools like contrast checkers are essential to verify compliance. When employing this color, consider providing alternative high-contrast themes to accommodate diverse user needs and maintain inclusivity. Thoughtful application and diligent testing are crucial to prevent accessibility barriers.

Shades

Digital Color Formats

RGB
4 53 176
RGB4 53 176
Red
Green
Blue
HSL
222.91deg 95.56% 35.29%
222.9195.5635.29HSL
Hue
Saturation
Lightness
HWB
222.91deg 1.57% 30.98%
222.911.5730.98HWB
Hue
Whiteness
Blackness
hex#0435B0
rgb4 53 176
hsl222.91deg 95.56% 35.29%
cmyk97.73% 69.89% 0% 30.98%
hwb222.91deg 1.57% 30.98%
xyz-d650.09 0.06 0.42
oklch0.3993 0.1994 263.4
oklab0.3993 -0.02 -0.2
CMYK
97.73% 69.89% 0% 30.98%
97.7369.89030.98CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.06 0.42
0.090.060.42XYZ
X
Y
Z
OKLCH
0.3993 0.1994 263.4
0.39930.1994263.4LCH
Lightness
Chroma
Hue
OKLAB
0.3993 -0.02 -0.2
0.3993-0.02-0.2LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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