International Klein Blue

#0128C9

About International Klein Blue

International Klein Blue (IKB), represented by the hex code #0128C9, is a deep blue hue first mixed by the French artist Yves Klein. Klein patented this color in 1957 to maintain its unique visual impact, ensuring its association with his artistic creations. The color is characterized by its intense saturation and ultramarine depth, often described as conveying a sense of boundlessness and immersion. Klein used this pigment in many of his iconic monochrome paintings and sculptures, aiming to evoke spiritual and emotional responses in viewers. IKB's registration as a specific color formula underscores its historical and artistic significance, setting it apart from other shades of blue. Its continued use in art and design demonstrates its enduring appeal and influence.

The color #0128C9, also known as International Klein Blue, presents significant accessibility challenges, particularly in web design. Its dark hue necessitates very light text for sufficient contrast, which can be problematic for users with visual impairments. According to WCAG guidelines, the contrast ratio between text and background should be at least 4.5:1 for normal text and 3:1 for large text. Using this color as a background requires careful consideration of text color choices to meet these standards. Lighter shades of yellow, white, or off-white are generally recommended to ensure readability and accessibility for all users. Avoid pairing this color with darker text colors or other dark shades, as it will likely fail accessibility checks and create a poor user experience. Proper testing with accessibility tools is crucial when implementing this color.

Shades

Digital Color Formats

RGB
1 40 201
RGB1 40 201
Red
Green
Blue
HSL
228.3deg 99.01% 39.61%
228.399.0139.61HSL
Hue
Saturation
Lightness
HWB
228.3deg 0.39% 21.18%
228.30.3921.18HWB
Hue
Whiteness
Blackness
hex#0128C9
rgb1 40 201
hsl228.3deg 99.01% 39.61%
cmyk99.5% 80.1% 0% 21.18%
hwb228.3deg 0.39% 21.18%
xyz-d650.11 0.06 0.56
oklch0.408 0.2416 264.19
oklab0.408 -0.02 -0.24
CMYK
99.5% 80.1% 0% 21.18%
99.580.1021.18CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.11 0.06 0.56
0.110.060.56XYZ
X
Y
Z
OKLCH
0.408 0.2416 264.19
0.4080.2416264.19LCH
Lightness
Chroma
Hue
OKLAB
0.408 -0.02 -0.24
0.408-0.02-0.24LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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