International Klein Blue

#0423C6

About International Klein Blue

International Klein Blue, often referred to as IKB, is a deep and intense blue pigment first synthesized in 1956 by the French artist Yves Klein. He collaborated with a Parisian paint dealer to achieve and maintain the color's unique visual impact. IKB's remarkable intensity arises from its high concentration of pigment, which is suspended in a synthetic resin that allows the color to retain its brilliance and matte texture. Klein patented the process to preserve the color's singularity, using it extensively in his monochrome paintings and sculptures. IKB has since become a significant part of art history, symbolizing purity, spirituality, and the infinite. It is often used in art, fashion, and design to evoke strong emotional responses and a sense of the sublime.

The hex color #0423c6, a deep and vibrant blue known as International Klein Blue, presents significant accessibility challenges. Its low luminance value means it offers very little contrast against light backgrounds, making it difficult for users with visual impairments to discern text or interactive elements. According to WCAG guidelines, sufficient contrast ratios are crucial for readability and usability. To improve accessibility, this color should ideally be paired with very light colors such as white (#ffffff) or very light grays. Using darker shades for text or interactive elements on a background of #0423c6 is strongly discouraged. Also avoid using smaller font sizes or thin fonts, as this would decrease readability even further. When this color is part of a design system or branding, consider providing alternative color themes that meet accessibility standards, especially for critical elements such as buttons and links. Providing high contrast alternatives ensures a better user experience for people with low vision or color blindness.

Shades

Digital Color Formats

RGB
4 35 198
RGB4 35 198
Red
Green
Blue
HSL
230.41deg 96.04% 39.61%
230.4196.0439.61HSL
Hue
Saturation
Lightness
HWB
230.41deg 1.57% 22.35%
230.411.5722.35HWB
Hue
Whiteness
Blackness
hex#0423C6
rgb4 35 198
hsl230.41deg 96.04% 39.61%
cmyk97.98% 82.32% 0% 22.35%
hwb230.41deg 1.57% 22.35%
xyz-d650.11 0.05 0.54
oklch0.3989 0.2418 264.57
oklab0.3989 -0.02 -0.24
CMYK
97.98% 82.32% 0% 22.35%
97.9882.32022.35CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.11 0.05 0.54
0.110.050.54XYZ
X
Y
Z
OKLCH
0.3989 0.2418 264.57
0.39890.2418264.57LCH
Lightness
Chroma
Hue
OKLAB
0.3989 -0.02 -0.24
0.3989-0.02-0.24LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

Buttons