#B73131
Closest named color: Firebrick (#B22222). oklch(52% 0.171 25.4), rgb(183, 49, 49).
Aa
White text reads best on this color (6.00:1).
About this color
#B73131 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.171 and its hue 25°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.026 away. White text reads best on it, at 6.00:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.171) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.49:1 |
| White text | 6.00:1 |
Values
| HEX | #B73131 |
| RGB | rgb(183, 49, 49) |
| HSL | hsl(0, 58%, 45%) |
| OKLCH | oklch(52% 0.171 25.4) |
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 #B73131 | 6.00:1 | AA | Lc -84.0 | Fine for body text |
| Black text on #B73131 | 3.49:1 | AA large text | Lc 25.3 | Dividers and decoration only |
| #B73131 text on white | 6.00:1 | AA | Lc 78.7 | Fine for body text |
| #B73131 text on black | 3.49:1 | AA large text | Lc -23.1 | 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
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#FAE4E2
oklch(93.6% 0.024 23.9)
-
Step 200
200
#F6CECA
oklch(88.4% 0.046 24.8)
-
Step 300
300
#F2ACA5
oklch(80.9% 0.084 25.5)
-
Step 400
400
#E77D75
oklch(70.6% 0.132 25.5)
-
Step 500
500
#DD5752
oklch(63.1% 0.169 25.3)
-
Step 600
600
#C83636
oklch(55.6% 0.183 25.5)
-
Step 700
700 (this color)
#B73131
oklch(52% 0.171 25.4)
-
Step 800
800
#8C2223
oklch(42.6% 0.142 25.1)
-
Step 900
900
#712321
oklch(37.7% 0.111 25.4)
-
Step 950
950
#421614
oklch(26.9% 0.069 25.4)
#B73131 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) | #585130 | 0.185 |
| Deuteranopia (no green cones) | #7A6E2C | 0.169 |
| Tritanopia (no blue cones) | #C90033 | 0.046 |
| Achromatopsia (no color) | #636363 | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B73131
#B73131
oklch(52% 0.171 25.4)
- #007782
#007782
oklch(52% 0.089 206.1)
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 #B73131, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.026
- Dull Red #BB3F3F ΔE 0.027
- Rusty Red #AF2F0D ΔE 0.033
- Scarlet #BE0119 ΔE 0.037
- Rufous #AE2012 ΔE 0.038
- Lipstick Red #C0022F ΔE 0.038
- Brown #A52A2A ΔE 0.041
- Sinopia #BB3E03 ΔE 0.044
Use #B73131 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.