International Klein Blue

#031DBF

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 registered this color as a trademark in 1957. IKB's visual impact comes from its heavy reliance on ultramarine pigment, as well as Klein's artistic vision of the color as representing boundlessness. The color has been used in various artistic and commercial applications since its creation. The unique shade is achieved through a specific formula that maximizes the visual effect of ultramarine, creating a sense of depth and intensity that is rarely found in other blue pigments. The color remains highly influential in art and design.

International Klein Blue (#031DBF) presents significant accessibility challenges, particularly in web design. Its dark hue results in very low contrast against light backgrounds, potentially violating WCAG guidelines for color contrast ratios. Text rendered in this color on a white or light-colored background would be difficult for users with low vision or color blindness to read. Similarly, using it for interactive elements like buttons or links could make them hard to distinguish. To improve accessibility, pair it with very light colors like white or pale yellow to ensure sufficient contrast (a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text). Consider providing alternative visual cues like underlines or icons for interactive elements, and always test color combinations with accessibility evaluation tools.

Shades

Digital Color Formats

RGB
3 29 191
RGB3 29 191
Red
Green
Blue
HSL
231.7deg 96.91% 38.04%
231.796.9138.04HSL
Hue
Saturation
Lightness
HWB
231.7deg 1.18% 25.1%
231.71.1825.1HWB
Hue
Whiteness
Blackness
hex#031DBF
rgb3 29 191
hsl231.7deg 96.91% 38.04%
cmyk98.43% 84.82% 0% 25.1%
hwb231.7deg 1.18% 25.1%
xyz-d650.1 0.05 0.5
oklch0.3835 0.2387 264.55
oklab0.3835 -0.02 -0.24
CMYK
98.43% 84.82% 0% 25.1%
98.4384.82025.1CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.1 0.05 0.5
0.10.050.5XYZ
X
Y
Z
OKLCH
0.3835 0.2387 264.55
0.38350.2387264.55LCH
Lightness
Chroma
Hue
OKLAB
0.3835 -0.02 -0.24
0.3835-0.02-0.24LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

Buttons