International Klein Blue

#0217A5

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, a pure, highly saturated pigment. Yves Klein registered this color as a trademark in 1957. The distinctiveness of IKB arises from its matte finish, which, unlike glossier paints, allows the pigment to retain its intensity and vibrancy. This color is strongly associated with Klein's artistic explorations of space and the infinite. In art history, IKB is more than just a color; it represents Klein's pursuit of transcending the physical world through art.

The color #0217A5, also known as International Klein Blue, presents significant accessibility challenges, especially in web design. Its extremely low luminance (very dark) means that text rendered in this color requires very light foreground text (white or near-white) to meet WCAG (Web Content Accessibility Guidelines) standards for contrast ratios. A contrast ratio of at least 4.5:1 for normal text and 3:1 for large text is necessary for Level AA compliance. Using this color for backgrounds necessitates careful selection of foreground elements. Ensure sufficient contrast to accommodate users with visual impairments. Tools for checking contrast ratios are essential when employing this color in digital interfaces. Be cautious about using this color for crucial interactive elements without testing for accessibility. Also, avoid pairing it with other dark or muted colors.

Shades

Digital Color Formats

RGB
2 23 165
RGB2 23 165
Red
Green
Blue
HSL
232.27deg 97.6% 32.75%
232.2797.632.75HSL
Hue
Saturation
Lightness
HWB
232.27deg 0.78% 35.29%
232.270.7835.29HWB
Hue
Whiteness
Blackness
hex#0217A5
rgb2 23 165
hsl232.27deg 97.6% 32.75%
cmyk98.79% 86.06% 0% 35.29%
hwb232.27deg 0.78% 35.29%
xyz-d650.07 0.03 0.36
oklch0.3435 0.2145 264.53
oklab0.3435 -0.02 -0.21
CMYK
98.79% 86.06% 0% 35.29%
98.7986.06035.29CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.07 0.03 0.36
0.070.030.36XYZ
X
Y
Z
OKLCH
0.3435 0.2145 264.53
0.34350.2145264.53LCH
Lightness
Chroma
Hue
OKLAB
0.3435 -0.02 -0.21
0.3435-0.02-0.21LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

Buttons