International Klein Blue

#001AB3

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 sought to create a blue that captured the essence of the sky and sea, embodying a sense of boundless space and spirituality. The color was officially patented in 1957 as a specific ultramarine pigment mixed with a synthetic resin binder, which maintains the color's brilliance and depth. This vibrant, matte blue has become iconic in the art world, often associated with Klein's monochrome paintings and sculptures. IKB's distinctive character stems from its ability to absorb and reflect light in a way that creates a mesmerizing, almost ethereal effect. The color continues to inspire artists, designers, and creatives across various fields, retaining its status as a symbol of artistic innovation and spiritual exploration.

The color #001AB3, a deep shade of blue also known as International Klein Blue, presents significant accessibility challenges, particularly when used as a foreground color against a white background or vice versa. Its low luminance contrast ratio necessitates careful consideration of font sizes and weights to ensure readability. According to WCAG guidelines, a contrast ratio of at least 4.5:1 is recommended for normal text and 3:1 for large text. This dark blue hue often falls short of these recommendations, potentially causing visual strain for users, especially those with low vision or color deficiencies. To improve accessibility, consider pairing #001AB3 with lighter shades of yellow, orange, or green to achieve sufficient contrast. Alternatively, using a lighter tint of blue or incorporating a contrasting border can enhance readability and overall user experience. Tools such as contrast checkers can help determine compliance with accessibility standards.

Shades

Digital Color Formats

RGB
0 26 179
RGB0 26 179
Red
Green
Blue
HSL
231.28deg 100% 35.1%
231.2810035.1HSL
Hue
Saturation
Lightness
HWB
231.28deg 0% 29.8%
231.28029.8HWB
Hue
Whiteness
Blackness
hex#001AB3
rgb0 26 179
hsl231.28deg 100% 35.1%
cmyk100% 85.47% 0% 29.8%
hwb231.28deg 0% 29.8%
xyz-d650.09 0.04 0.43
oklch0.3644 0.2282 264.22
oklab0.3644 -0.02 -0.23
CMYK
100% 85.47% 0% 29.8%
10085.47029.8CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.04 0.43
0.090.040.43XYZ
X
Y
Z
OKLCH
0.3644 0.2282 264.22
0.36440.2282264.22LCH
Lightness
Chroma
Hue
OKLAB
0.3644 -0.02 -0.23
0.3644-0.02-0.23LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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