International Klein Blue

#0217B2

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 initiative to propagate its image. The visual effect of IKB is achieved by a matte, synthetic resin binder which suspends the color pigment and allows the pigment to maintain its maximum color expression. Yves Klein registered this paint formula as a trademark under the name International Klein Blue (IKB) in 1957. It has since become a recognizable and iconic color in the art world, known for its depth and captivating visual presence. Its unique history and distinctive appearance have solidified its place in art history and continue to inspire artists and designers today.

The color #0217B2, also known as International Klein Blue, presents significant accessibility challenges, particularly for users with visual impairments. Its extremely low luminance value (very close to black) means that text or interactive elements using this color as a foreground need to be paired with a very light background to meet WCAG (Web Content Accessibility Guidelines) contrast requirements. A contrast ratio of at least 4.5:1 is recommended for normal text and 3:1 for large text or graphical elements. Failing to meet these contrast ratios can render content illegible for many users. When using this color, carefully consider its impact on users with color blindness. While its deep blue hue may be distinguishable for some, ensure that crucial information isn't conveyed solely through color. Provide redundant cues, such as text labels or icons, to ensure accessibility for all users. Thoroughly test color combinations with accessibility tools to validate contrast ratios and simulate different types of color blindness.

Shades

Digital Color Formats

RGB
2 23 178
RGB2 23 178
Red
Green
Blue
HSL
232.84deg 97.78% 35.29%
232.8497.7835.29HSL
Hue
Saturation
Lightness
HWB
232.84deg 0.78% 30.2%
232.840.7830.2HWB
Hue
Whiteness
Blackness
hex#0217B2
rgb2 23 178
hsl232.84deg 97.78% 35.29%
cmyk98.88% 87.08% 0% 30.2%
hwb232.84deg 0.78% 30.2%
xyz-d650.08 0.04 0.42
oklch0.3606 0.2287 264.49
oklab0.3606 -0.02 -0.23
CMYK
98.88% 87.08% 0% 30.2%
98.8887.08030.2CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.08 0.04 0.42
0.080.040.42XYZ
X
Y
Z
OKLCH
0.3606 0.2287 264.49
0.36060.2287264.49LCH
Lightness
Chroma
Hue
OKLAB
0.3606 -0.02 -0.23
0.3606-0.02-0.23LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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