International Klein Blue

#0039B4

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 patented this color in 1957. What distinguishes IKB from other blues is its remarkable purity and intensity. The color achieves its vividness through the use of a synthetic ultramarine pigment suspended in a resin binder, allowing the pigment to maintain its brilliance and depth. IKB is not just a color; it's an artistic statement, representing boundless space, depth, and the infinite. It has become a symbol of Klein's artistic vision and a testament to the power of color in conveying complex ideas and emotions. The unique matte finish further enhances its intensity, making it stand out from other blues.

International Klein Blue (#0039B4) presents some accessibility challenges, particularly when used as a text color on a white or light background. Its relatively low luminance contrast can make it difficult for users with visual impairments to read the text comfortably. According to WCAG guidelines, a contrast ratio of at least 4.5:1 is recommended for normal text and 3:1 for large text. When using #0039B4, it's crucial to ensure sufficient contrast by pairing it with a very light color for the background, or conversely, using it as a background color with very light text. To improve accessibility, consider using a color contrast checker to verify the contrast ratio and adjust colors accordingly. Alternatively, providing visual cues such as underlines or bolding for links can further enhance usability for all users.

Shades

Digital Color Formats

RGB
0 57 180
RGB0 57 180
Red
Green
Blue
HSL
221 100% 35.29%
22110035.29HSL
Hue
Saturation
Lightness
HWB
221 0% 29.41%
221029.41HWB
Hue
Whiteness
Blackness
hex#0039B4
rgb0 57 180
hsl221 100% 35.29%
cmyk100% 68.33% 0% 29.41%
hwb221 0% 29.41%
xyz9.7 6.22 43.87
CMYK
100% 68.33% 0% 29.41%
10068.33029.41CMYK
Cyan
Magenta
Yellow
Key
XYZ
9.7 6.22 43.87
9.76.2243.87XYZ
X
Y
Z

Alternative colors

Applications

Complementary color

Buttons

HexColo.rs © 2025