International Klein Blue

#001F9F

About International Klein Blue

International Klein Blue, often abbreviated as IKB, is a deep blue hue first mixed by the French artist Yves Klein. Klein registered this color as a trademark in 1957. The visual impact of IKB comes from its heavy reliance on ultramarine pigment, as well as Klein's artistic use of a matte, synthetic resin binder, which suspends the color pigment and allows the pigment to maintain its original qualities. This color is particularly known for its intensity and vibrancy. The color has been used in various art installations and continues to inspire artists and designers across different disciplines due to its captivating and unique appearance. It represents a specific shade of blue that is both distinctive and memorable, holding a significant place in the history of modern art.

The hex color #001f9f, also known as International Klein Blue, presents certain accessibility challenges, especially in web design. Its dark hue results in low contrast against lighter backgrounds, potentially making text and other elements difficult to read for users with visual impairments. According to WCAG guidelines, sufficient contrast is crucial for ensuring readability. A contrast ratio of at least 4.5:1 is recommended for standard text and 3:1 for large text. When using #001f9f, it's essential to pair it with a very light color, such as white or a pale yellow, to meet these contrast requirements. Tools like contrast checkers can help verify compliance. Additionally, avoid using this color for interactive elements without clear visual cues, as users may struggle to identify them. Providing alternative styling options, such as high-contrast themes, can further improve accessibility.

Shades

Digital Color Formats

RGB
0 31 159
RGB0 31 159
Red
Green
Blue
HSL
228.3 100% 31.18%
228.310031.18HSL
Hue
Saturation
Lightness
HWB
228.3 0% 37.65%
228.3037.65HWB
Hue
Whiteness
Blackness
hex#001F9F
rgb0 31 159
hsl228.3 100% 31.18%
cmyk100% 80.5% 0% 37.65%
hwb228.3 0% 37.65%
xyz6.75 3.48 33.12
CMYK
100% 80.5% 0% 37.65%
10080.5037.65CMYK
Cyan
Magenta
Yellow
Key
XYZ
6.75 3.48 33.12
6.753.4833.12XYZ
X
Y
Z

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