International Klein Blue

#0021B7

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 patented this color to maintain its unique artistic identity. Chemically, it's a specific ultramarine pigment that achieves its striking intensity due to a synthetic process ensuring high purity and fineness. The color is known for its matte finish, achieved by suspending the pigment in a synthetic resin, which enhances its visual impact by minimizing light reflection. IKB is not just a color; it is intrinsically linked to Yves Klein's artistic explorations, symbolizing his focus on pure color as a vehicle for transcendence and conveying emotion. It represents a specific historical and artistic movement and continues to inspire artists and designers today due to its unique depth and vibrancy.

International Klein Blue (#0021B7) presents accessibility challenges due to its low luminance. When used as a background color, sufficient contrast with foreground text is crucial for readability, especially for users with visual impairments. According to WCAG guidelines, a contrast ratio of at least 4.5:1 is recommended for normal text and 3:1 for large text. This color may not meet these standards with light-colored text, necessitating careful consideration of text color choices or the addition of a darkening filter to the background. Designers should use contrast checking tools to ensure compliance and consider providing alternative color schemes for users who require them. Its intensity may also cause discomfort or trigger sensitivities in some individuals, so mindful application is essential. Using it for decorative elements rather than essential information can mitigate potential accessibility issues.

Shades

Digital Color Formats

RGB
0 33 183
RGB0 33 183
Red
Green
Blue
HSL
229.18deg 100% 35.88%
229.1810035.88HSL
Hue
Saturation
Lightness
HWB
229.18deg 0% 28.24%
229.18028.24HWB
Hue
Whiteness
Blackness
hex#0021B7
rgb0 33 183
hsl229.18deg 100% 35.88%
cmyk100% 81.97% 0% 28.24%
hwb229.18deg 0% 28.24%
xyz-d650.09 0.05 0.45
oklch0.3772 0.2274 264.15
oklab0.3772 -0.02 -0.23
CMYK
100% 81.97% 0% 28.24%
10081.97028.24CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.05 0.45
0.090.050.45XYZ
X
Y
Z
OKLCH
0.3772 0.2274 264.15
0.37720.2274264.15LCH
Lightness
Chroma
Hue
OKLAB
0.3772 -0.02 -0.23
0.3772-0.02-0.23LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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