International Klein Blue

#0439B0

About International Klein Blue

International Klein Blue, represented by the hex code #0439B0, is a deep, vivid blue hue patented by the French artist Yves Klein. It is renowned for its intense saturation and unique matte finish, achieved by suspending pure ultramarine pigment in a synthetic resin. Klein's intention was to capture and preserve the pure essence of blue, believing it to represent the immaterial and the infinite. The color is more than just a visual experience; it's an artistic statement, a philosophical exploration of color's power to evoke emotion and transcend physical reality. Today, International Klein Blue is widely recognized and used across various creative fields, from art and design to fashion and branding, symbolizing creativity, innovation, and a quest for the absolute.

The hex color #0439B0, also known as International Klein Blue, presents specific accessibility considerations for web developers. Given its deep, saturated hue, it's imperative to ensure sufficient contrast against background colors, particularly for text elements. A contrast ratio of at least 4.5:1 is recommended for normal text and 3:1 for large text (14pt bold or 18pt regular) to comply with WCAG 2.1 AA standards. When using this color for interactive elements like buttons or links, developers should provide clear visual cues, such as hover or focus states, to enhance usability for users with visual impairments. Furthermore, avoid relying solely on color to convey meaning; supplement it with text labels or icons to ensure information is accessible to all users, including those with color vision deficiencies. Proper attention to these aspects will promote inclusivity and a better user experience.

Shades

Digital Color Formats

RGB
4 57 176
RGB4 57 176
Red
Green
Blue
HSL
221.51deg 95.56% 35.29%
221.5195.5635.29HSL
Hue
Saturation
Lightness
HWB
221.51deg 1.57% 30.98%
221.511.5730.98HWB
Hue
Whiteness
Blackness
hex#0439B0
rgb4 57 176
hsl221.51deg 95.56% 35.29%
cmyk97.73% 67.61% 0% 30.98%
hwb221.51deg 1.57% 30.98%
xyz-d650.09 0.06 0.42
oklch0.4064 0.1949 262.94
oklab0.4064 -0.02 -0.19
CMYK
97.73% 67.61% 0% 30.98%
97.7367.61030.98CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.06 0.42
0.090.060.42XYZ
X
Y
Z
OKLCH
0.4064 0.1949 262.94
0.40640.1949262.94LCH
Lightness
Chroma
Hue
OKLAB
0.4064 -0.02 -0.19
0.4064-0.02-0.19LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

Buttons