#B43523
Closest named color: Rusty Red (#AF2F0D). oklch(51.8% 0.167 31.2), rgb(180, 53, 35).
Aa
White text reads best on this color (6.04:1).
About this color
#B43523 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.167 and its hue 31°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.019 away. White text reads best on it, at 6.04:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.167) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.47:1 |
| White text | 6.04:1 |
Values
| HEX | #B43523 |
| RGB | rgb(180, 53, 35) |
| HSL | hsl(7, 67%, 42%) |
| OKLCH | oklch(51.8% 0.167 31.2) |
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 #B43523 | 6.04:1 | AA | Lc -84.3 | Fine for body text |
| Black text on #B43523 | 3.47:1 | AA large text | Lc 25.0 | Dividers and decoration only |
| #B43523 text on white | 6.04:1 | AA | Lc 79.0 | Fine for body text |
| #B43523 text on black | 3.47:1 | AA large text | Lc -22.8 | 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
#F5CFC7
oklch(88.5% 0.044 31.9)
-
Step 300
300
#F0AEA1
oklch(80.9% 0.08 31.4)
-
Step 400
400
#E5806E
oklch(70.7% 0.128 31.2)
-
Step 500
500
#DB5B47
oklch(63.1% 0.165 31.1)
-
Step 600
600
#C63B27
oklch(55.5% 0.179 31.3)
-
Step 700
700 (this color)
#B43523
oklch(51.8% 0.167 31.2)
-
Step 800
800
#8B2618
oklch(42.7% 0.139 31.1)
-
Step 900
900
#70261A
oklch(37.8% 0.108 31.6)
-
Step 950
950
#421710
oklch(27% 0.069 31.3)
#B43523 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) | #5B5120 | 0.174 |
| Deuteranopia (no green cones) | #7A6D1D | 0.160 |
| Tritanopia (no blue cones) | #C60032 | 0.057 |
| Achromatopsia (no color) | #636363 | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B43523
#B43523
oklch(51.8% 0.167 31.2)
- #007686
#007686
oklch(51.9% 0.09 211.1)
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 #B43523, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.019
- Firebrick #B22222 ΔE 0.028
- Sinopia #BB3E03 ΔE 0.031
- Rufous #AE2012 ΔE 0.034
- Dull Red #BB3F3F ΔE 0.034
- Rust Red #AA2704 ΔE 0.035
- Brick #A03623 ΔE 0.040
- Brown #A52A2A ΔE 0.041
Use #B43523 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.