Firebrick4
firebrick4 · #8B1A1A
HEX
#8B1A1A
RGB
rgb(139, 26, 26)
CMYK
cmyk(0%, 81%, 81%, 45%)
HSL
hsl(0, 68%, 32%)
LAB
lab(30.2, 46.2, 30.6)
What is Firebrick4?
Firebrick4 is the firebrick4 reference in the X11 named colors. Its sRGB value is #8B1A1A (rgb 139, 26, 26). It sits in the red family. Historical X Window System color names — the numbered 1-4 lightness variants of the classic xorg-server rgb.txt palette. See disclaimer for accuracy and trademark notes.
Accessibility
WCAG 2.1 contrast checks for Firebrick4 as a background.
Black text on this color
White text on this color
Shades, tints & tonal scale of Firebrick4
An 11-step tonal scale derived from Firebrick4 (#8B1A1A). Click any swatch to copy its HEX. Use these as a starting point for design tokens, hover states, and disabled states in a design system.
50
#F6EDED
#F6EDED
100
#ECDADA
#ECDADA
200
#DAB6B6
#DAB6B6
300
#C58D8D
#C58D8D
400
#A85353
#A85353
500
#8B1A1A
#8B1A1A
600
#761616
#761616
700
#5A1111
#5A1111
800
#3F0C0C
#3F0C0C
900
#230707
#230707
950
#110303
#110303
Lighter tints (mixed with white)
15%
#A46F6F
30%
#B89797
45%
#CAB4B4
60%
#DACCCC
75%
#E9E1E1
Darker shades (mixed with black)
15%
#811717
30%
#761414
45%
#691111
60%
#5A0D0D
75%
#480909
Color harmonies for Firebrick4
Classic color-theory harmonies derived from rotating the hue of Firebrick4. Use these to build accent palettes, brand systems, and accessible UI color pairings.
Complementary
180° opposite — strongest contrast
#8B1A1A
#8B1A1A
#1A8989
#1A8989
Triadic
Three colors 120° apart
#8B1A1A
#8B1A1A
#1A891A
#1A891A
#1A1A89
#1A1A89
Analogous
Two neighbors ±30° on the wheel
#891A52
#891A52
#8B1A1A
#8B1A1A
#89521A
#89521A
Split-complementary
Base + two colors flanking its complement
#8B1A1A
#8B1A1A
#1A8952
#1A8952
#1A5289
#1A5289
Tetradic
Two complementary pairs
#8B1A1A
#8B1A1A
#89891A
#89891A
#1A8989
#1A8989
#1A1A89
#1A1A89
Square
Four colors evenly spaced 90° apart
#8B1A1A
#8B1A1A
#52891A
#52891A
#1A8989
#1A8989
#521A89
#521A89
Firebrick4 in every color space
Full conversion of Firebrick4 across the color spaces designers and developers actually use — including OKLCH (the perceptually-uniform space that powers Tailwind v4 and CSS Color Module Level 4) and HWB.
HEX
#8B1A1A
RGB
rgb(139, 26, 26)
CMYK
cmyk(0%, 81%, 81%, 45%)
HSL
hsl(0, 68%, 32%)
HSV
hsv(0, 81%, 55%)
HWB
hwb(0 10% 45%)
CIE Lab
lab(30.2 46.2 30.6)
OKLCH
oklch(41.6% 0.148 26.6)
XYZ (D65)
xyz(11.20, 6.30, 1.60)
Copy-ready code for Firebrick4
Drop-in snippets for CSS, Tailwind, Sass, iOS Swift, and Android XML. Click the copy button on any snippet to put it on your clipboard.
CSS
color: #8B1A1A;
background-color: #8B1A1A;CSS variable
:root {
--color-firebrick4: #8B1A1A;
}Tailwind config
// tailwind.config.js
colors: {
'firebrick4': '#8B1A1A',
}Sass
$color-firebrick4: #8B1A1A;Swift UIColor
UIColor(red: 0.545, green: 0.102, blue: 0.102, alpha: 1.0)Android XML
<color name="firebrick4">#8B1A1A</color>Closest match in every color system
The nearest Firebrick4 equivalent in every other color system on this site, ranked by ΔE2000 perceptual distance. Useful when translating between design-system, web-standard, and industrial color references.
Closest in X11 named colors
Top 6 ΔE2000-closest entries within the same collection.
Closest Pantone matches
Top 6 ΔE2000-closest Pantone references. Cross-system matching is approximate — see disclaimer.
Closest RAL Classic matches
Top 6 ΔE2000-closest RAL Classic references for industrial coating cross-reference.
RAL 3003
#9B111E
Ruby red
RAL 3011
#781F19
Brown red
RAL 3002
#A2231D
Carmine red
RAL 3001
#A52019
Signal red
RAL 3004
#75151E
Purple red
RAL 3013
#A12312
Tomato red
FAQ about Firebrick4
What is the HEX code for Firebrick4?
Firebrick4 (firebrick4) has the HEX code #8B1A1A. In RGB it is rgb(139, 26, 26), and in CMYK it is cmyk(0%, 81%, 81%, 45%).
What is the OKLCH value of Firebrick4?
Firebrick4 converts to oklch(0.416 0.148 26.6). OKLCH is the perceptually uniform color space used by Tailwind v4 and CSS Color Module Level 4.
Is Firebrick4 accessible for body text?
Used as a background, Firebrick4 has a contrast ratio of 2.26:1 with black text and 9.29:1 with white text. WCAG 2.1 AA requires 4.5:1 for normal text. The current recommendation is to use white text and verify in real UI context.
What is the closest Pantone to Firebrick4?
The closest Pantone reference to Firebrick4 by ΔE2000 perceptual distance is Pantone 187 C (#A6192E). Cross-system Pantone matching is approximate; for color-critical print work, verify with a physical Pantone guide.
What is the closest RAL color to Firebrick4?
The closest RAL Classic reference to Firebrick4 by ΔE2000 distance is RAL 3003 (Ruby red, #9B111E). RAL is a German industrial coating standard commonly used for paint, powder coat, and architectural specification.
What is the complementary color of Firebrick4?
The complementary color (180° opposite on the HSL color wheel) of Firebrick4 is #1A8989. Use it for high-contrast accents, error states, or call-to-action pairings.
Data provenance & source
X11 named colors (xorg rgb.txt)
The historical X11 color name list shipped in the xorg-server rgb.txt file. Roughly 550 entries covering classic computing color names like 'PapayaWhip', 'MediumAquamarine', and 'DarkSlateGray'. Many CSS named colors originate here. Use as a reference for legacy and creative color names. Most modern CSS implementations accept these names directly.
- Source type
- derived
- Confidence
- high
- License
- MIT/X11 license (X Consortium)
- Last reviewed
- 2026-05-24
Workflow tags
X11 colors are sRGB digital values from a 1980s color system. For print, convert to a process-appropriate color and proof against substrate.