#B43138
Closest named color: Firebrick (#B22222). oklch(51.6% 0.167 22.5), rgb(180, 49, 56).
Aa
White text reads best on this color (6.10:1).
About this color
#B43138 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.167 and its hue 23°. 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 6.10:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.167) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.43:1 |
| White text | 6.10:1 |
Values
| HEX | #B43138 |
| RGB | rgb(180, 49, 56) |
| HSL | hsl(357, 57%, 45%) |
| OKLCH | oklch(51.6% 0.167 22.5) |
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 #B43138 | 6.10:1 | AA | Lc -84.5 | Fine for body text |
| Black text on #B43138 | 3.43:1 | AA large text | Lc 24.8 | Dividers and decoration only |
| #B43138 text on white | 6.10:1 | AA | Lc 79.3 | Fine for body text |
| #B43138 text on black | 3.43:1 | AA large text | Lc -22.5 | 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
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#F9E4E3
oklch(93.5% 0.023 20.9)
-
Step 200
200
#F6CECC
oklch(88.5% 0.045 21.4)
-
Step 300
300
#F1ACA9
oklch(80.9% 0.082 21.8)
-
Step 400
400
#E67E7B
oklch(70.7% 0.129 22.6)
-
Step 500
500
#DB5859
oklch(63% 0.165 22.6)
-
Step 600
600
#C7373F
oklch(55.6% 0.18 22.4)
-
Step 700
700 (this color)
#B43138
oklch(51.6% 0.167 22.5)
-
Step 800
800
#8B2429
oklch(42.7% 0.138 22.8)
-
Step 900
900
#702426
oklch(37.8% 0.108 22.4)
-
Step 950
950
#421616
oklch(27% 0.069 22.8)
#B43138 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) | #565037 | 0.182 |
| Deuteranopia (no green cones) | #776C34 | 0.167 |
| Tritanopia (no blue cones) | #C60035 | 0.045 |
| Achromatopsia (no color) | #626262 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B43138
#B43138
oklch(51.6% 0.167 22.5)
- #00767E
#00767E
oklch(51.6% 0.088 203.1)
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 #B43138, 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 0.029
- Brown #A52A2A ΔE 0.037
- Rusty Red #AF2F0D ΔE 0.038
- Lipstick Red #C0022F ΔE 0.038
- Rufous #AE2012 ΔE 0.039
- Scarlet #BE0119 ΔE 0.041
- Rose Red #BE013C ΔE 0.043
Use #B43138 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.