Ultramarine

#18179D

General Information About Ultramarine

The hex color #18179D, also known as Ultramarine, is a deep and intense shade of blue. It falls within the blue color family and is characterized by its strong saturation and relatively low lightness. In the RGB color model, it is composed of 9.41% red, 8.24% green, and 61.57% blue. In the CMYK color model, commonly used in printing, it consists of 85% cyan, 87% magenta, 0% yellow, and 38% black. Ultramarine is often associated with feelings of trust, stability, and depth. Historically, ultramarine pigment was derived from the gemstone lapis lazuli, making it a highly prized and expensive color, often reserved for use in religious art. Nowadays, synthetic versions allow for widespread use of this color in various applications, ranging from web design to fashion.

The hex color #18179d, a deep shade of ultramarine, presents both challenges and opportunities regarding accessibility. Its low luminance value necessitates careful consideration of text and interactive element contrast. According to WCAG guidelines, to ensure readability for users with visual impairments, text using this color as a background requires a light color for sufficient contrast. A contrast ratio of at least 4.5:1 is recommended for standard text and 3:1 for large text. Using online contrast checkers is crucial to verify compliance. Furthermore, avoid using this color as the sole indicator for interactive elements, such as links or buttons, as colorblind users might not perceive them. Supplement visual cues with text labels, icons, or underlines to enhance usability for all users. Thoughtful application of this striking color can still result in an inclusive and engaging user experience.

Shades

Digital Color Formats

RGB
24 23 157
RGB24 23 157
Red
Green
Blue
HSL
240.45deg 74.44% 35.29%
240.4574.4435.29HSL
Hue
Saturation
Lightness
HWB
240.45deg 9.02% 38.43%
240.459.0238.43HWB
Hue
Whiteness
Blackness
hex#18179D
rgb24 23 157
hsl240.45deg 74.44% 35.29%
cmyk84.71% 85.35% 0% 38.43%
hwb240.45deg 9.02% 38.43%
xyz-d650.07 0.03 0.32
oklch0.3398 0.2011 269.08
oklab0.3398 0 -0.2
CMYK
84.71% 85.35% 0% 38.43%
84.7185.35038.43CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.07 0.03 0.32
0.070.030.32XYZ
X
Y
Z
OKLCH
0.3398 0.2011 269.08
0.33980.2011269.08LCH
Lightness
Chroma
Hue
OKLAB
0.3398 0 -0.2
0.33980-0.2LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

Buttons