The hexadecimal color code #21100D represents a very dark shade in the red family. In the RGB color model, this color is composed of 33 red, 16 green, and 13 blue, which translates to approximately 13% red, 6% green, and 5% blue. This makes it a slightly desaturated color with warm undertones that can evoke different emotional responses depending on its application.
When analyzed in the HSL (Hue, Saturation, Lightness) color space, #21100D has a hue of 9 degrees, a saturation level of 43%, and a lightness value of 9%. The hue angle of 9° places this color firmly in the red spectrum. In the HSV/HSB color model, this translates to a hue of 9°, saturation of 61%, and brightness/value of 13%.
For print applications using the CMYK color model, #21100D would be reproduced using 0% cyan, 52% magenta, 61% yellow, and 87% black. The closest web-safe color is #330000, which may be useful for ensuring compatibility across older displays and systems.
This color works well in various design contexts. As a darker shade, it works well for text, headers, and creating visual weight in compositions. The moderate to low saturation gives this color a sophisticated, muted quality that works well in professional and minimalist designs. When pairing #21100D with other colors, consider its complementary color at hue 189° for maximum contrast, or use analogous colors within 30° of its hue for harmonious combinations. The decimal representation of this color is 2166797, which can be useful in certain programming contexts.
🔢 Color Conversion Codes for #21100D
Tailwind CSS
stone-900
HEX
#21100D
RGB
rgb(33, 16, 13)
RGB %
13%, 6%, 5%
HSL
hsl(9, 43%, 9%)
HSV
hsv(9, 61%, 13%)
CMYK
0%, 52%, 61%, 87%
Decimal
2166797
Web Safe
#330000
🎨 Color Schemes for #21100D
Complementary
Analogous
Triadic
Split Complementary
Tetradic (Rectangle)
🔄 Alternatives to #21100D
🌗 Shades and Tints of #21100D
Shades (adding black)
Tints (adding white)
🎚️ Tones of #21100D
Tones (adding gray / desaturating)
🌈 Hue Variations of #21100D
Hue Variations (shifting the color spectrum)
👁️ Preview of #21100D in Use
Text on #21100D
This demonstrates text readability on the color background. (Click to edit)
#21100D as Text
This shows the color used as text on white. (Click to edit)
👓 Color Blindness Simulation for #21100D
Check how a color is perceived by people with different types of color blindness to create more accessible designs. Understanding color perception helps ensure your content is accessible to everyone.
Deep Red is a dark, moderately saturated, warm red color with a hue angle of 9°, saturation of 43%, and lightness of 9%. Its RGB value is (33, 16, 13) and its CMYK breakdown is C:0% M:52% Y:61% K:87%.
This is a Winter (Deep) color palette archetype. Passion, Energy, Action, Danger. Red is a powerful color that evokes strong emotions and captures attention immediately.
Frequently Asked Questions About #21100D
What is the HEX code for Deep Red? +
The HEX code for Deep Red is #21100D. In CSS you can use it directly as color: #21100D; or as a background: background-color: #21100D;. The three-character shorthand is not available for this color since it cannot be reduced without changing the value. Use the full six-character hex for accurate reproduction in any web or design project.
What is the RGB value of #21100D? +
The RGB value of #21100D is rgb(33, 16, 13). This means the color contains 33 out of 255 parts red, 16 out of 255 parts green, and 13 out of 255 parts blue. Red is the strongest channel in this color mix. You can use the full RGB function in any CSS property: color: rgb(33, 16, 13);
What is the HSL value of #21100D? +
The HSL value of #21100D is hsl(9, 43%, 9%). The hue is 9°, placing it in the red family on the color wheel. The saturation is 43%, making it moderately saturated. The lightness is 9%, making it dark. HSL is the most useful format for programmatic color manipulation in CSS, as you can easily adjust lightness to create tints and shades.
Is #21100D a warm or cool color? +
#21100D is classified as a warm color based on its hue angle of 9°. Warm colors — reds, oranges, and yellows — evoke energy, enthusiasm, and urgency. They tend to advance visually and draw the eye. In design, warm colors are often used for calls-to-action, food and hospitality brands, and anywhere a feeling of warmth or excitement is desired.
What is the CMYK value of #21100D? +
The approximate CMYK value of #21100D is C:0% M:52% Y:61% K:87%. CMYK (Cyan, Magenta, Yellow, Key/Black) is the color model used in physical printing. Unlike RGB which mixes light additively on screens, CMYK mixes inks subtractively on paper. Note that the RGB-to-CMYK conversion is an approximation — screen colors and print colors exist in different color gamuts, and some screen colors cannot be exactly reproduced in print. For precise print work, consult a professional print color profile or Pantone matching system.
