International Klein Blue

#0323B1

About International Klein Blue

International Klein Blue (IKB), hex code #0323B1, is a deep shade of blue first mixed by the French artist Yves Klein. Klein patented this color to maintain its unique and vibrant quality. It is known for its intense, ultramarine hue, achieved through a specific combination of pigments and a synthetic resin binder. The color is intended to evoke feelings of depth and boundlessness. Klein used IKB extensively in his monochrome paintings and sculptures, seeking to create a purely visual experience that transcended the physical object. The color has since become iconic and is used in various fields, from art and design to fashion and branding, often to convey a sense of sophistication, depth, and creativity. It's essential to consider the psychological impact and cultural associations when using this distinct color.

The hex color #0323B1, also known as International Klein Blue, presents considerable accessibility challenges. Its very dark hue results in extremely low contrast against typical light backgrounds like white or light gray. This can make text or graphical elements using this color difficult or even impossible to read for individuals with visual impairments. Ensuring sufficient contrast is crucial for accessibility, especially for users with low vision or color blindness. According to WCAG guidelines, a contrast ratio of at least 4.5:1 is recommended for standard text and 3:1 for large text. #0323B1 falls far short of these recommendations when paired with light backgrounds. To improve accessibility, it is advisable to use a much lighter color for text on this background or to choose a considerably lighter color as a background if #0323B1 is used for text. Tools are available online to calculate the contrast ratio between two colors, aiding developers in making informed decisions for optimal readability.

Shades

Digital Color Formats

RGB
3 35 177
RGB3 35 177
Red
Green
Blue
HSL
228.97 96.67% 35.29%
228.9796.6735.29HSL
Hue
Saturation
Lightness
HWB
228.97 1.18% 30.59%
228.971.1830.59HWB
Hue
Whiteness
Blackness
hex#0323B1
rgb3 35 177
hsl228.97 96.67% 35.29%
cmyk98.31% 80.23% 0% 30.59%
hwb228.97 1.18% 30.59%
xyz8.57 4.4 41.99
CMYK
98.31% 80.23% 0% 30.59%
98.3180.23030.59CMYK
Cyan
Magenta
Yellow
Key
XYZ
8.57 4.4 41.99
8.574.441.99XYZ
X
Y
Z

Alternative colors

Applications

Complementary color

Buttons

HexColo.rs © 2025