#B5431C
Closest named color: Sinopia (#BB3E03). oklch(53.5% 0.156 38), rgb(181, 67, 28).
Aa
White text reads best on this color (5.54:1).
About this color
#B5431C is a medium-dark, vivid red. In OKLCH its lightness is 54%, its chroma 0.156 and its hue 38°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.015 away. White text reads best on it, at 5.54:1.
| Hue family | Reds |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.156) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.78:1 |
| White text | 5.54:1 |
Values
| HEX | #B5431C |
| RGB | rgb(181, 67, 28) |
| HSL | hsl(15, 73%, 41%) |
| OKLCH | oklch(53.5% 0.156 38) |
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 #B5431C | 5.54:1 | AA | Lc -82.1 | Fine for body text |
| Black text on #B5431C | 3.78:1 | AA large text | Lc 27.3 | Dividers and decoration only |
| #B5431C text on white | 5.54:1 | AA | Lc 76.8 | Fine for body text |
| #B5431C text on black | 3.78:1 | AA large text | Lc -24.9 | 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 600.
-
Step 50
50
#FCF3F1
oklch(97.1% 0.01 32.5)
-
Step 100
100
#F7E6E0
oklch(93.7% 0.02 40.5)
-
Step 200
200
#F1D1C7
oklch(88.5% 0.039 38.1)
-
Step 300
300
#EAB2A0
oklch(81% 0.07 38.6)
-
Step 400
400
#DD876C
oklch(70.8% 0.113 38.2)
-
Step 500
500
#D16644
oklch(63.2% 0.144 38.2)
-
Step 600
600 (this color)
#B5431C
oklch(53.5% 0.156 38)
-
Step 700
700
#A23A16
oklch(49.1% 0.145 38)
-
Step 800
800
#833115
oklch(42.6% 0.12 38.3)
-
Step 900
900
#6A2C19
oklch(37.7% 0.094 37.6)
-
Step 950
950
#3E1B0F
oklch(27% 0.059 39.4)
#B5431C 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) | #645815 | 0.156 |
| Deuteranopia (no green cones) | #807216 | 0.143 |
| Tritanopia (no blue cones) | #C7243C | 0.068 |
| Achromatopsia (no color) | #686868 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B5431C
#B5431C
oklch(53.5% 0.156 38)
- #007A92
#007A92
oklch(53.5% 0.096 217.9)
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 #B5431C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.015
- Brick Orange #C14A09 ΔE 0.031
- Cinnamon #AC4F06 ΔE 0.033
- Burnt Siena #B75203 ΔE 0.037
- Burnt Orange #C04E01 ΔE 0.037
- Rusty Red #AF2F0D ΔE 0.038
- Dull Red #BB3F3F ΔE 0.039
- Burnt Umber #A0450E ΔE 0.043
Use #B5431C 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.