International Klein Blue

#0419B0

About International Klein Blue

International Klein Blue, often abbreviated as IKB, is a deep blue hue first mixed by the French artist Yves Klein. Klein registered this color as a trademark in 1957, although the trademark's validity has been debated. What sets IKB apart is its remarkable saturation and intensity. The color is achieved using a synthetic ultramarine pigment, and Klein often used a matte, synthetic resin binder that allowed the pigment to retain its brilliance and depth. This unique combination creates a visually striking color that seems to possess an almost ethereal quality. IKB has become a symbol of Klein's artistic vision and continues to inspire artists, designers, and color enthusiasts worldwide.

International Klein Blue (#0419B0) offers a unique challenge in web accessibility due to its deep, saturated hue. When using this color for text, it is crucial to ensure a high contrast ratio against the background. White or very light shades of yellow or green are generally recommended for text on an IKB background. Tools like the WebAIM Contrast Checker can be invaluable in verifying compliance with WCAG guidelines, aiming for a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text. It is important to avoid pairing IKB with other dark colors, as this can make content illegible for users with low vision or color blindness. Thoughtful application is key to making IKB accessible and visually appealing.

Shades

Digital Color Formats

RGB
4 25 176
RGB4 25 176
Red
Green
Blue
HSL
232.67 95.56% 35.29%
232.6795.5635.29HSL
Hue
Saturation
Lightness
HWB
232.67 1.57% 30.98%
232.671.5730.98HWB
Hue
Whiteness
Blackness
hex#0419B0
rgb4 25 176
hsl232.67 95.56% 35.29%
cmyk97.73% 85.8% 0% 30.98%
hwb232.67 1.57% 30.98%
xyz8.23 3.86 41.38
CMYK
97.73% 85.8% 0% 30.98%
97.7385.8030.98CMYK
Cyan
Magenta
Yellow
Key
XYZ
8.23 3.86 41.38
8.233.8641.38XYZ
X
Y
Z

Alternative colors

Applications

Complementary color

Buttons

HexColo.rs © 2025