International Klein Blue

#051AA6

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 artistic use of this particular color. The color was synthesized in 1956 or 1957 by the paint manufacturer Edouard Adam at the behest of Yves Klein, who wanted to capture the intensity and luminosity of pure ultramarine pigment. The uniqueness of IKB does not come from the chemical composition of the pigment itself, but rather from the matte, synthetic resin binder in which the color is suspended, and which allows the pigment to maintain its qualities.

The hex color #051AA6, also known as International Klein Blue, presents accessibility challenges, particularly for users with visual impairments. Its high darkness value means that text rendered in this color requires a very light foreground to achieve sufficient contrast. According to WCAG guidelines, a contrast ratio of at least 4.5:1 is recommended for standard text and 3:1 for large text. When using #051AA6 for backgrounds, ensure that any text or interactive elements placed on top meet these contrast requirements. Tools like contrast checkers can help verify compliance. Additionally, consider providing alternative color schemes for users who may have difficulty perceiving the color due to color blindness. Avoid using this color as the sole indicator of important information, such as error messages, without supplementary cues like text labels or icons.

Shades

Digital Color Formats

RGB
5 26 166
RGB5 26 166
Red
Green
Blue
HSL
232.17deg 94.15% 33.53%
232.1794.1533.53HSL
Hue
Saturation
Lightness
HWB
232.17deg 1.96% 34.9%
232.171.9634.9HWB
Hue
Whiteness
Blackness
hex#051AA6
rgb5 26 166
hsl232.17deg 94.15% 33.53%
cmyk96.99% 84.34% 0% 34.9%
hwb232.17deg 1.96% 34.9%
xyz-d650.07 0.04 0.36
oklch0.3487 0.213 264.94
oklab0.3487 -0.02 -0.21
CMYK
96.99% 84.34% 0% 34.9%
96.9984.34034.9CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.07 0.04 0.36
0.070.040.36XYZ
X
Y
Z
OKLCH
0.3487 0.213 264.94
0.34870.213264.94LCH
Lightness
Chroma
Hue
OKLAB
0.3487 -0.02 -0.21
0.3487-0.02-0.21LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

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