International Klein Blue

#042FAF

About International Klein Blue

International Klein Blue (IKB), with the hex code #042FAF, is a deep blue hue first synthesized by the French artist Yves Klein. Klein patented the color in 1957 to maintain its unique visual impact in his artworks. IKB's intense saturation is achieved by suspending pure color pigment in a clear synthetic resin, maintaining its vividness without diffusion. This color is celebrated for its ultramarine-like depth and distinctive matte finish. Its mesmerizing appearance makes it a favorite in art, fashion, and design. Klein's vision was to capture the purest expression of blue, evoking feelings of boundless space and spiritual depth. The color has since become an iconic symbol of modern art and creativity.

The color #042FAF, also known as International Klein Blue, presents some accessibility challenges due to its relatively low luminance. When used as a background color, it requires very light text to ensure sufficient contrast for readability. A contrast ratio of at least 4.5:1 is recommended for normal-sized text, as per WCAG guidelines. For larger text (14pt bold or 18pt regular), a contrast ratio of 3:1 is acceptable. It is crucial to test color combinations using accessibility tools to verify compliance. Consider providing alternative color schemes for users with visual impairments or color blindness. Using this intense blue sparingly can enhance accessibility, focusing on high-contrast elements for critical information. Ensure interactive elements meet contrast requirements for usability.

Shades

Digital Color Formats

RGB
4 47 175
RGB4 47 175
Red
Green
Blue
HSL
224.91deg 95.53% 35.1%
224.9195.5335.1HSL
Hue
Saturation
Lightness
HWB
224.91deg 1.57% 31.37%
224.911.5731.37HWB
Hue
Whiteness
Blackness
hex#042FAF
rgb4 47 175
hsl224.91deg 95.53% 35.1%
cmyk97.71% 73.14% 0% 31.37%
hwb224.91deg 1.57% 31.37%
xyz-d650.09 0.05 0.41
oklch0.3881 0.2047 263.92
oklab0.3881 -0.02 -0.2
CMYK
97.71% 73.14% 0% 31.37%
97.7173.14031.37CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.05 0.41
0.090.050.41XYZ
X
Y
Z
OKLCH
0.3881 0.2047 263.92
0.38810.2047263.92LCH
Lightness
Chroma
Hue
OKLAB
0.3881 -0.02 -0.2
0.3881-0.02-0.2LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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