International Klein Blue

#0435B5

About International Klein Blue

International Klein Blue, also known as IKB, is a deep shade of blue that was developed and patented by the French artist Yves Klein. This vibrant color is renowned for its unique intensity and ultramarine hue, achieved through a specific formula of pigment and a synthetic resin binder. Klein sought to capture the purest expression of blue, associating it with concepts of spirituality and boundless space. The color has since become iconic in the art world and has been used in various fields, including fashion, design, and branding. Its distinctive character makes it instantly recognizable and deeply impactful, lending a sense of sophistication and depth to any application. Today, the color continues to inspire artists and designers alike, solidifying its status as a timeless and influential hue.

The color #0435B5, also known as International Klein Blue, presents some accessibility challenges. With a very dark hue and low lightness value, it provides insufficient contrast when used as text against a white background, making it difficult for users with visual impairments to read. To improve accessibility, consider using a lighter color for the text or a significantly lighter shade of blue for the background. Alternatively, pairing it with a very light, contrasting color such as yellow or white can enhance readability. Ensure a contrast ratio of at least 4.5:1 for normal text and 3:1 for large text, as recommended by WCAG guidelines. Using tools to check color contrast is essential to ensure that the design is accessible to all users, including those with low vision or color blindness. Proper color contrast ensures that important information is easily discernible.

Shades

Digital Color Formats

RGB
4 53 181
RGB4 53 181
Red
Green
Blue
HSL
223.39deg 95.68% 36.27%
223.3995.6836.27HSL
Hue
Saturation
Lightness
HWB
223.39deg 1.57% 29.02%
223.391.5729.02HWB
Hue
Whiteness
Blackness
hex#0435B5
rgb4 53 181
hsl223.39deg 95.68% 36.27%
cmyk97.79% 70.72% 0% 29.02%
hwb223.39deg 1.57% 29.02%
xyz-d650.1 0.06 0.44
oklch0.4046 0.2056 263.55
oklab0.4046 -0.02 -0.2
CMYK
97.79% 70.72% 0% 29.02%
97.7970.72029.02CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.1 0.06 0.44
0.10.060.44XYZ
X
Y
Z
OKLCH
0.4046 0.2056 263.55
0.40460.2056263.55LCH
Lightness
Chroma
Hue
OKLAB
0.4046 -0.02 -0.2
0.4046-0.02-0.2LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

Buttons