International Klein Blue

#0339B0

About International Klein Blue

International Klein Blue (IKB) is a deep blue hue first mixed by the French artist Yves Klein. Klein worked with a Parisian paint supplier, Edouard Adam, to achieve and maintain the color's unique visual impact. The extraordinary vividness of IKB results from its reliance on a matte, synthetic resin binder, which suspends the color pigment and allows the pigment to retain as much of its original qualities as possible. This allows for a maximum concentration of pure pigment and delivers its visual impact. Yves Klein registered IKB as a trademark in 1957, although the formula has never been patented. It has since become a recognizable color in art and design, often associated with depth, infinity, and the immaterial.

The color #0339B0, also known as International Klein Blue (IKB), presents significant accessibility challenges, particularly in web design. Due to its low luminance value, using it as a background color requires extremely light text to ensure sufficient contrast. According to WCAG guidelines, the contrast ratio between text and background should be at least 4.5:1 for normal text and 3:1 for large text. IKB often fails to meet these criteria when paired with standard dark or mid-tone text colors. Therefore, it's crucial to use contrast checkers to verify compliance. When incorporating IKB into designs, consider using it sparingly for graphic elements or accents rather than large blocks of color. Providing alternative high-contrast themes for users is another excellent way to enhance accessibility. Ensure that interactive elements using IKB have clear visual cues beyond color alone, such as underlines or icons, to assist users with color vision deficiencies.

Shades

Digital Color Formats

RGB
3 57 176
RGB3 57 176
Red
Green
Blue
HSL
221.27deg 96.65% 35.1%
221.2796.6535.1HSL
Hue
Saturation
Lightness
HWB
221.27deg 1.18% 30.98%
221.271.1830.98HWB
Hue
Whiteness
Blackness
hex#0339B0
rgb3 57 176
hsl221.27deg 96.65% 35.1%
cmyk98.3% 67.61% 0% 30.98%
hwb221.27deg 1.18% 30.98%
xyz-d650.09 0.06 0.42
oklch0.4062 0.195 262.84
oklab0.4062 -0.02 -0.19
CMYK
98.3% 67.61% 0% 30.98%
98.367.61030.98CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.06 0.42
0.090.060.42XYZ
X
Y
Z
OKLCH
0.4062 0.195 262.84
0.40620.195262.84LCH
Lightness
Chroma
Hue
OKLAB
0.4062 -0.02 -0.19
0.4062-0.02-0.19LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

Buttons