International Klein Blue

#0333B0

About International Klein Blue

International Klein Blue, also known 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 usage of the color. Yves Klein registered this brilliant shade as a trademark in 1957. It is a vivid hue of blue and is often associated with art and sophistication. It is created using a unique pigment blend, making it stand out from other blues. This color has been extensively used in modern and contemporary art, fashion, and design, becoming a symbol of creativity and innovation. Its distinctive appearance makes it easily recognizable and highly valued in various creative fields.

The hex color #0333b0, also known as International Klein Blue, presents significant accessibility challenges, particularly in web design. Its very dark hue results in a low contrast ratio when paired with lighter text colors like white or light gray. This necessitates careful consideration to ensure sufficient contrast for readability, especially for users with visual impairments. A contrast ratio of at least 4.5:1 is recommended by WCAG guidelines for normal text and 3:1 for large text. Using online contrast checkers can help assess the compliance of text and background color combinations. To improve accessibility, designers could explore using a lighter shade of blue or pairing #0333b0 with very light, almost white, text. Additionally, providing alternative text descriptions for images and using ARIA attributes can further enhance the accessibility of content using this color.

Shades

Digital Color Formats

RGB
3 51 176
RGB3 51 176
Red
Green
Blue
HSL
223.35deg 96.65% 35.1%
223.3596.6535.1HSL
Hue
Saturation
Lightness
HWB
223.35deg 1.18% 30.98%
223.351.1830.98HWB
Hue
Whiteness
Blackness
hex#0333B0
rgb3 51 176
hsl223.35deg 96.65% 35.1%
cmyk98.3% 71.02% 0% 30.98%
hwb223.35deg 1.18% 30.98%
xyz-d650.09 0.06 0.42
oklch0.3957 0.2017 263.49
oklab0.3957 -0.02 -0.2
CMYK
98.3% 71.02% 0% 30.98%
98.371.02030.98CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.06 0.42
0.090.060.42XYZ
X
Y
Z
OKLCH
0.3957 0.2017 263.49
0.39570.2017263.49LCH
Lightness
Chroma
Hue
OKLAB
0.3957 -0.02 -0.2
0.3957-0.02-0.2LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

Buttons