International Klein Blue

#091FC1

About International Klein Blue

International Klein Blue, often referred to 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 questioned over the years. What distinguishes IKB is its reliance on a matte, synthetic resin binder that allows the pigment to maintain its brilliance, giving the color its striking intensity. The specific pigment used is ultramarine, a naturally occurring pigment derived from lapis lazuli. IKB is often associated with concepts of immateriality and infinity. It has been used extensively in Klein's monochrome paintings and sculptures, becoming a signature element of his artistic expression. The color's unique visual impact has made it a popular choice in various design fields.

The hex color #091FC1, also known as International Klein Blue, presents accessibility challenges due to its dark and saturated nature. When used as a background color, sufficient contrast is essential for readability. According to WCAG guidelines, a contrast ratio of at least 4.5:1 is recommended for normal text and 3:1 for large text. Pairing #091FC1 with white or very light shades of yellow or green can improve contrast. Avoid using it with dark or similarly saturated colors, as this can lead to eye strain and make content difficult to perceive for users with visual impairments. When using this color for interactive elements like buttons or links, ensure that there is a distinct visual cue, such as a change in color or an underline, on hover or focus to meet accessibility standards. Provide sufficient spacing between elements using this color to avoid visual crowding.

Shades

Digital Color Formats

RGB
9 31 193
RGB9 31 193
Red
Green
Blue
HSL
232.83deg 91.09% 39.61%
232.8391.0939.61HSL
Hue
Saturation
Lightness
HWB
232.83deg 3.53% 24.31%
232.833.5324.31HWB
Hue
Whiteness
Blackness
hex#091FC1
rgb9 31 193
hsl232.83deg 91.09% 39.61%
cmyk95.34% 83.94% 0% 24.31%
hwb232.83deg 3.53% 24.31%
xyz-d650.1 0.05 0.51
oklch0.3892 0.2386 265.17
oklab0.3892 -0.02 -0.24
CMYK
95.34% 83.94% 0% 24.31%
95.3483.94024.31CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.1 0.05 0.51
0.10.050.51XYZ
X
Y
Z
OKLCH
0.3892 0.2386 265.17
0.38920.2386265.17LCH
Lightness
Chroma
Hue
OKLAB
0.3892 -0.02 -0.24
0.3892-0.02-0.24LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

Buttons