International Klein Blue

#021CB2

About International Klein Blue

International Klein Blue, often abbreviated as IKB, is a deep blue hue first mixed by the French artist Yves Klein. The color's visual impact comes from its heavy reliance on ultramarine pigment, as well as Klein's patent of a unique matte, synthetic resin-based binder which allows the pigment to maintain its vibrancy and original qualities. The color is registered as a trademark in Klein's name. It's renowned for its intense depth and striking visual presence. IKB is often associated with concepts of infinity, spirituality, and the immaterial. It represents Klein's quest to capture pure, unadulterated color. The color plays an important role in modern art and design and maintains a high level of recognition.

The color #021CB2, also known as International Klein Blue, presents some accessibility challenges, especially when used as a background color for text. Due to its very dark hue and low luminance, it demands careful consideration of contrast ratios to ensure readability. According to WCAG guidelines, a contrast ratio of at least 4.5:1 is required for normal-sized text and 3:1 for large text (14pt bold or 18pt regular) against its background. Therefore, pairing #021CB2 with light colors like white (#FFFFFF) or very light shades of yellow or grey is crucial. Using darker colors for text on an #021CB2 background will likely result in poor readability and should be avoided. Tools such as contrast checkers can help determine if a color combination meets accessibility standards. For graphical elements and user interface components, a contrast ratio of 3:1 is required against adjacent colors. Consider providing alternative high-contrast themes for users with visual impairments.

Shades

Digital Color Formats

RGB
2 28 178
RGB2 28 178
Red
Green
Blue
HSL
231.14 97.78% 35.29%
231.1497.7835.29HSL
Hue
Saturation
Lightness
HWB
231.14 0.78% 30.2%
231.140.7830.2HWB
Hue
Whiteness
Blackness
hex#021CB2
rgb2 28 178
hsl231.14 97.78% 35.29%
cmyk98.88% 84.27% 0% 30.2%
hwb231.14 0.78% 30.2%
xyz8.48 4.06 42.46
CMYK
98.88% 84.27% 0% 30.2%
98.8884.27030.2CMYK
Cyan
Magenta
Yellow
Key
XYZ
8.48 4.06 42.46
8.484.0642.46XYZ
X
Y
Z

Alternative colors

Applications

Complementary color

Buttons

HexColo.rs © 2025