#B31F12
Closest named color: Rufous (#AE2012). oklch(49.5% 0.184 30), rgb(179, 31, 18).
Aa
White text reads best on this color (6.72:1).
About this color
#B31F12 is a medium-dark, vivid red. In OKLCH its lightness is 50%, its chroma 0.184 and its hue 30°. Its hue sits on the warm side of the wheel. The nearest named color is Rufous (#AE2012), ΔE 0.010 away. White text reads best on it, at 6.72:1.
| Hue family | Reds |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.184) |
| Temperature | warm |
| Nearest name | Rufous (#AE2012) |
| Black text | 3.12:1 |
| White text | 6.72:1 |
Values
| HEX | #B31F12 |
| RGB | rgb(179, 31, 18) |
| HSL | hsl(5, 82%, 39%) |
| OKLCH | oklch(49.5% 0.184 30) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #B31F12 | 6.72:1 | AA | Lc -86.5 | Fine for body text |
| Black text on #B31F12 | 3.12:1 | AA large text | Lc 22.7 | Dividers and decoration only |
| #B31F12 text on white | 6.72:1 | AA | Lc 81.4 | Fine for body text |
| #B31F12 text on black | 3.12:1 | AA large text | Lc -20.5 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#FBE4E0
oklch(93.6% 0.026 29.4)
-
Step 200
200
#F8CEC6
oklch(88.5% 0.049 30.7)
-
Step 300
300
#F5AB9F
oklch(80.9% 0.09 29.4)
-
Step 400
400
#EC7B6A
oklch(70.7% 0.143 29.9)
-
Step 500
500
#E25241
oklch(63% 0.182 29.8)
-
Step 600
600
#CE2E1F
oklch(55.7% 0.198 29.9)
-
Step 700
700 (this color)
#B31F12
oklch(49.5% 0.184 30)
-
Step 800
800
#901D12
oklch(42.7% 0.152 30)
-
Step 900
900
#742017
oklch(37.8% 0.119 29.7)
-
Step 950
950
#44140E
oklch(26.9% 0.076 29.9)
#B31F12 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #51470D | 0.198 |
| Deuteranopia (no green cones) | #746704 | 0.180 |
| Tritanopia (no blue cones) | #C6001F | 0.041 |
| Achromatopsia (no color) | #5C5C5C | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B31F12
#B31F12
oklch(49.5% 0.184 30)
- #006F7D
#006F7D
oklch(49.6% 0.086 209.9)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #B31F12, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rufous #AE2012 ΔE 0.010
- Firebrick #B22222 ΔE 0.011
- Rust Red #AA2704 ΔE 0.021
- Rusty Red #AF2F0D ΔE 0.021
- Scarlet #BE0119 ΔE 0.026
- Brown #A52A2A ΔE 0.032
- Lipstick Red #C0022F ΔE 0.041
- Burnt Red #9F2305 ΔE 0.042
Use #B31F12 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.