#B1311C
Closest named color: Rusty Red (#AF2F0D). oklch(50.7% 0.168 32), rgb(177, 49, 28).
Aa
White text reads best on this color (6.31:1).
About this color
#B1311C is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.168 and its hue 32°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.010 away. White text reads best on it, at 6.31:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.168) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.32:1 |
| White text | 6.31:1 |
Values
| HEX | #B1311C |
| RGB | rgb(177, 49, 28) |
| HSL | hsl(8, 73%, 40%) |
| OKLCH | oklch(50.7% 0.168 32) |
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 #B1311C | 6.31:1 | AA | Lc -85.4 | Fine for body text |
| Black text on #B1311C | 3.32:1 | AA large text | Lc 23.9 | Dividers and decoration only |
| #B1311C text on white | 6.31:1 | AA | Lc 80.2 | Fine for body text |
| #B1311C text on black | 3.32:1 | AA large text | Lc -21.7 | 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
#F9E5E0
oklch(93.7% 0.023 34.3)
-
Step 200
200
#F6CFC7
oklch(88.6% 0.046 31.6)
-
Step 300
300
#F0AEA0
oklch(80.9% 0.081 32.3)
-
Step 400
400
#E6806C
oklch(70.8% 0.13 32.2)
-
Step 500
500
#DB5B44
oklch(63.1% 0.166 32.2)
-
Step 600
600
#C73B24
oklch(55.7% 0.181 32)
-
Step 700
700 (this color)
#B1311C
oklch(50.7% 0.168 32)
-
Step 800
800
#8B2615
oklch(42.7% 0.139 32.1)
-
Step 900
900
#702519
oklch(37.7% 0.109 31.6)
-
Step 950
950
#42170F
oklch(27% 0.069 32.4)
#B1311C 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) | #584E18 | 0.176 |
| Deuteranopia (no green cones) | #776A15 | 0.161 |
| Tritanopia (no blue cones) | #C3002E | 0.054 |
| Achromatopsia (no color) | #606060 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B1311C
#B1311C
oklch(50.7% 0.168 32)
- #007283
#007283
oklch(50.7% 0.089 212.6)
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 #B1311C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.010
- Firebrick #B22222 ΔE 0.022
- Rufous #AE2012 ΔE 0.024
- Rust Red #AA2704 ΔE 0.024
- Brick #A03623 ΔE 0.033
- Brown #A52A2A ΔE 0.034
- Sinopia #BB3E03 ΔE 0.037
- Russet #A13905 ΔE 0.037
Use #B1311C 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.