International Klein Blue

#0721C3

About International Klein Blue

International Klein Blue, often abbreviated as IKB, is a deep blue hue first mixed by the French artist Yves Klein. The visual impact of IKB comes from its heavy reliance on ultramarine pigment, as well as Klein's patent for a matte, synthetic resin that maintains the color's brilliance. Klein developed IKB specifically for his monochrome paintings, seeking to capture the purest expression of blue. The color is not just a pigment but is seen as a concept, representing the infinite and immaterial. Klein considered the color a medium to convey ideas and evoke a sense of boundlessness. Today, IKB remains a distinctive and iconic color in the art world.

The hex color #0721c3, also known as International Klein Blue, presents significant accessibility challenges due to its low luminance. When used as a foreground color against a white or light background, the contrast ratio is extremely poor, making it difficult for users with visual impairments to read the text. According to WCAG guidelines, a contrast ratio of at least 4.5:1 is recommended for normal text and 3:1 for large text. #0721c3 falls far short of these recommendations. To improve accessibility, consider using a lighter background color or a significantly lighter foreground color. Tools like WebAIM's Contrast Checker can help determine if the color combination meets accessibility standards. It is also crucial to avoid using this color alone to convey important information, relying instead on labels or other visual cues.

Shades

Digital Color Formats

RGB
7 33 195
RGB7 33 195
Red
Green
Blue
HSL
231.7deg 93.07% 39.61%
231.793.0739.61HSL
Hue
Saturation
Lightness
HWB
231.7deg 2.75% 23.53%
231.72.7523.53HWB
Hue
Whiteness
Blackness
hex#0721C3
rgb7 33 195
hsl231.7deg 93.07% 39.61%
cmyk96.41% 83.08% 0% 23.53%
hwb231.7deg 2.75% 23.53%
xyz-d650.1 0.05 0.52
oklch0.3935 0.2396 264.92
oklab0.3935 -0.02 -0.24
CMYK
96.41% 83.08% 0% 23.53%
96.4183.08023.53CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.1 0.05 0.52
0.10.050.52XYZ
X
Y
Z
OKLCH
0.3935 0.2396 264.92
0.39350.2396264.92LCH
Lightness
Chroma
Hue
OKLAB
0.3935 -0.02 -0.24
0.3935-0.02-0.24LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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