International Klein Blue

#0621AE

About International Klein Blue

International Klein Blue (IKB), with the hex code #0621AE, is a deep ultramarine blue hue that was first synthesized by the French artist Yves Klein. Klein sought to create a blue that embodied his artistic vision of pure color, devoid of representational associations. To achieve this, he collaborated with a chemist to develop a unique matte, synthetic resin binder that would suspend the pigment and maintain its purity and vibrancy. IKB is not just a color; it is a statement. It is often associated with concepts of infinity, spirituality, and the immaterial, reflecting Klein's artistic philosophy. The color has since been trademarked, solidifying its status as a distinct and iconic hue within the art world and beyond.

The hex color #0621ae, also known as International Klein Blue, presents significant accessibility challenges, particularly in web design. Due to its low luminance value, text rendered in this color against a white or light-colored background will likely fail WCAG (Web Content Accessibility Guidelines) contrast ratio requirements. These guidelines are essential for ensuring that web content is usable by individuals with visual impairments. To improve accessibility, consider pairing this color with very light shades of yellow or very dark shades of grey for text or interactive elements. Tools like contrast checkers can help evaluate the color combination against WCAG standards, ensuring compliance and a better user experience for all users, including those with disabilities. It's crucial to prioritize readability and usability when incorporating such a vibrant color into a design.

Shades

Digital Color Formats

RGB
6 33 174
RGB6 33 174
Red
Green
Blue
HSL
230.36 93.33% 35.29%
230.3693.3335.29HSL
Hue
Saturation
Lightness
HWB
230.36 2.35% 31.76%
230.362.3531.76HWB
Hue
Whiteness
Blackness
hex#0621AE
rgb6 33 174
hsl230.36 93.33% 35.29%
cmyk96.55% 81.03% 0% 31.76%
hwb230.36 2.35% 31.76%
xyz8.26 4.18 40.42
CMYK
96.55% 81.03% 0% 31.76%
96.5581.03031.76CMYK
Cyan
Magenta
Yellow
Key
XYZ
8.26 4.18 40.42
8.264.1840.42XYZ
X
Y
Z

Alternative colors

Applications

Complementary color

Buttons

HexColo.rs © 2025