International Klein Blue

#0921C1

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 vision. The color's intensity and purity distinguish it from other shades of blue. Klein registered IKB as a trademark in 1957, solidifying its place in art history. Chemically, the color is achieved through a specific formula involving a synthetic resin binder that allows the pigment to maintain its brilliance and saturation. Its widespread use in modern art and design demonstrates its enduring appeal and symbolic significance. It often represents depth, spirituality, and the infinite. The unique matte finish further enhances its visual impact, giving it a velvety texture that absorbs light rather than reflecting it.

The hex color #0921c1, also known as International Klein Blue, presents significant accessibility challenges, particularly for users with visual impairments. Its dark hue results in a very low luminance value, necessitating careful consideration of contrast ratios. When used as a background color, it requires a very light foreground color (like white or a very pale yellow) to meet WCAG (Web Content Accessibility Guidelines) standards for contrast. A contrast ratio of at least 4.5:1 is required for normal text and 3:1 for large text to ensure readability for most users. For users with more severe visual impairments, a contrast ratio of 7:1 is recommended. Avoid using #0921c1 for essential interactive elements like buttons or links without ensuring sufficient contrast. Providing alternative color schemes or a high-contrast mode can greatly improve the accessibility of content using this color. Furthermore, relying solely on color to convey information should be avoided; supplementary cues like text labels or icons should be used to ensure inclusivity.

Shades

Digital Color Formats

RGB
9 33 193
RGB9 33 193
Red
Green
Blue
HSL
232.17deg 91.09% 39.61%
232.1791.0939.61HSL
Hue
Saturation
Lightness
HWB
232.17deg 3.53% 24.31%
232.173.5324.31HWB
Hue
Whiteness
Blackness
hex#0921C1
rgb9 33 193
hsl232.17deg 91.09% 39.61%
cmyk95.34% 82.9% 0% 24.31%
hwb232.17deg 3.53% 24.31%
xyz-d650.1 0.05 0.51
oklch0.3914 0.2372 265.14
oklab0.3914 -0.02 -0.24
CMYK
95.34% 82.9% 0% 24.31%
95.3482.9024.31CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.1 0.05 0.51
0.10.050.51XYZ
X
Y
Z
OKLCH
0.3914 0.2372 265.14
0.39140.2372265.14LCH
Lightness
Chroma
Hue
OKLAB
0.3914 -0.02 -0.24
0.3914-0.02-0.24LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

Buttons