Crimson Hex Code — #DC143C

The hex color code for Crimson is #DC143C. In CSS, apply it as text color with color: #DC143C;, as a background with background-color: #DC143C;, or as a border with border-color: #DC143C;. Hex is the most widely used color notation on the web because it is compact, supported by every browser, and easy to copy between design tools like Figma, Photoshop, and code editors.

Crimson in RGB is rgb(220, 20, 60), where Red=220, Green=20, and Blue=60 on a 0-255 scale. Use RGB when you need transparency — rgba(220, 20, 60, 0.5) creates a 50% transparent version. RGB is also the native format for HTML canvas, WebGL, and JavaScript image manipulation, since each channel represents the intensity of that primary light color on screen displays.

Crimson can be applied in CSS using multiple formats: (1) Hex: color: #DC143C; — most compact and widely used. (2) RGB: color: rgb(220, 20, 60); — useful when calculating colors dynamically in JavaScript. (3) HSL: color: hsl(348, 83%, 47%); — best for creating variations, since adjusting lightness produces lighter or darker shades while keeping the same hue. (4) With transparency: rgba(220, 20, 60, 0.8); or hsla(348, 83%, 47%, 0.8); for 80% opacity overlays.

Crimson in HSL is hsl(348, 83%, 47%). HSL stands for Hue (348 degrees on the color wheel), Saturation (83% color intensity), and Lightness (47% brightness). HSL is the most intuitive format for designers because you can create harmonious palettes by rotating the hue, generate hover effects by increasing lightness by 10%, and desaturate colors by reducing the S value. This makes Crimson a medium, vivid warm-toned color.

Crimson in CMYK is C:0% M:91% Y:73% K:14%. CMYK (Cyan, Magenta, Yellow, Key/Black) is the standard color model for professional printing — business cards, brochures, merchandise, and packaging. When designing for print in Adobe InDesign or Illustrator, use these exact CMYK values to ensure accurate color reproduction. Screen colors (RGB) often appear more vibrant than their printed CMYK equivalents, so always request a physical proof for brand-critical materials.

Red pairs well with white for high contrast, with dark navy for a classic look, or with gold for a premium feel. In UI design, reserve red for error states or destructive actions to maintain user expectations.

Red text on white needs a dark shade (below #CC0000) to meet WCAG AA contrast. Always pair red indicators with an icon or label — about 8% of men have red-green color blindness and may not perceive the color alone. For Crimson specifically: as a medium shade (lightness: 47%), it can work as a text color on light backgrounds, but verify the exact contrast ratio using a contrast checker tool. WCAG 2.1 requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text (18px+ bold or 24px+ regular).