International Klein Blue

#051DBB

About International Klein Blue

International Klein Blue, also known as IKB, is a deep blue hue first mixed by the French artist Yves Klein. Klein created IKB in collaboration with a Parisian paint supplier, E. Adam, to achieve a particular intensity and purity of color. The visual effect of IKB comes from its heavy reliance on ultramarine pigment, as well as Klein's matte, synthetic resin binder which suspends the pigment and allows the color to achieve its maximum vibrancy. Yves Klein registered this paint formula as a trademark under the name International Klein Blue (IKB) in 1957. The color became renowned as a symbol of Klein's artistic exploration of pure color and the infinite. He used this color extensively in his paintings, sculptures, and performances, solidifying its place in art history. IKB remains a distinctive and recognizable color to this day, widely used in art, design, and fashion.

The color #051DBB, also known as International Klein Blue, presents significant accessibility challenges, particularly in web design. Its very dark hue results in low contrast when paired with lighter text colors, potentially making content difficult for users with visual impairments to read. Adherence to WCAG (Web Content Accessibility Guidelines) is crucial when employing this color. A contrast ratio of at least 4.5:1 is recommended for normal text and 3:1 for large text against background elements. Therefore, using light text directly on an #051DBB background would likely fail accessibility standards. Designers should consider using a lighter tint of blue or pairing it with very light colors like white or a pale yellow to ensure readability. Tools for checking color contrast ratios are readily available online and should be utilized during the design process. For users with color blindness, the color could be problematic. It might be perceived differently, making it essential to ensure that information conveyed through color is also available through other means, such as text or icons. If links or other interactive elements are differentiated solely by color, adding text labels or other visual cues becomes imperative to provide an inclusive and accessible experience for all users.

Shades

Digital Color Formats

RGB
5 29 187
RGB5 29 187
Red
Green
Blue
HSL
232.09deg 94.79% 37.65%
232.0994.7937.65HSL
Hue
Saturation
Lightness
HWB
232.09deg 1.96% 26.67%
232.091.9626.67HWB
Hue
Whiteness
Blackness
hex#051DBB
rgb5 29 187
hsl232.09deg 94.79% 37.65%
cmyk97.33% 84.49% 0% 26.67%
hwb232.09deg 1.96% 26.67%
xyz-d650.09 0.04 0.47
oklch0.3788 0.234 264.79
oklab0.3788 -0.02 -0.23
CMYK
97.33% 84.49% 0% 26.67%
97.3384.49026.67CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.04 0.47
0.090.040.47XYZ
X
Y
Z
OKLCH
0.3788 0.234 264.79
0.37880.234264.79LCH
Lightness
Chroma
Hue
OKLAB
0.3788 -0.02 -0.23
0.3788-0.02-0.23LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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