International Klein Blue

#0B1EBF

About International Klein Blue

International Klein Blue, often abbreviated as IKB, is a deep blue hue first mixed by the French artist Yves Klein. IKB's visual impact comes from its heavy reliance on ultramarine, as well as Klein's matte, synthetic resin binder, which allows the pigment to maintain its brilliance. Yves Klein registered this recipe as a trademark under the name International Klein Blue (IKB) in 1957. This specific shade of blue is highly saturated and evokes feelings of depth, spirituality, and boundlessness. It has been used extensively in art, fashion, and design, becoming a symbol of modernity and artistic expression. The color's intensity is one of the keys to the strong impact and uniqueness. This color is visually appealing, but may not be the best choice for all applications, especially when readability and usability are important.

The hex color #0B1EBF, also known as International Klein Blue, presents significant accessibility challenges, particularly for users with visual impairments. Its high saturation and relatively low luminance contrast with many common background colors, such as white, can make text and interface elements difficult to read. According to WCAG guidelines, sufficient contrast ratios are essential for ensuring content is perceivable. To improve accessibility, it's crucial to pair this vibrant blue with lighter hues like white, light grey, or bright yellow to achieve a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text. Also, designers should avoid using this color for critical interface elements without proper contrast. Alternative color combinations, such as using it sparingly as an accent color against a neutral background, can mitigate potential accessibility issues. Providing alternative text descriptions for images that heavily rely on this color can further enhance the experience for screen reader users. Proper color choice is key for inclusive design.

Shades

Digital Color Formats

RGB
11 30 191
RGB11 30 191
Red
Green
Blue
HSL
233.67deg 89.11% 39.61%
233.6789.1139.61HSL
Hue
Saturation
Lightness
HWB
233.67deg 4.31% 25.1%
233.674.3125.1HWB
Hue
Whiteness
Blackness
hex#0B1EBF
rgb11 30 191
hsl233.67deg 89.11% 39.61%
cmyk94.24% 84.29% 0% 25.1%
hwb233.67deg 4.31% 25.1%
xyz-d650.1 0.05 0.5
oklch0.386 0.2369 265.42
oklab0.386 -0.02 -0.24
CMYK
94.24% 84.29% 0% 25.1%
94.2484.29025.1CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.1 0.05 0.5
0.10.050.5XYZ
X
Y
Z
OKLCH
0.386 0.2369 265.42
0.3860.2369265.42LCH
Lightness
Chroma
Hue
OKLAB
0.386 -0.02 -0.24
0.386-0.02-0.24LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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