#B42B10
Closest named color: Rusty Red (#AF2F0D). oklch(50.6% 0.177 32.7), rgb(180, 43, 16).
Aa
White text reads best on this color (6.37:1).
About this color
#B42B10 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.177 and its hue 33°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.011 away. White text reads best on it, at 6.37:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.177) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.29:1 |
| White text | 6.37:1 |
Values
| HEX | #B42B10 |
| RGB | rgb(180, 43, 16) |
| HSL | hsl(10, 84%, 38%) |
| OKLCH | oklch(50.6% 0.177 32.7) |
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 #B42B10 | 6.37:1 | AA | Lc -85.4 | Fine for body text |
| Black text on #B42B10 | 3.29:1 | AA large text | Lc 23.8 | Dividers and decoration only |
| #B42B10 text on white | 6.37:1 | AA | Lc 80.2 | Fine for body text |
| #B42B10 text on black | 3.29:1 | AA large text | Lc -21.6 | 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
#FAE4DF
oklch(93.5% 0.025 32.9)
-
Step 200
200
#F7CEC5
oklch(88.4% 0.048 32.5)
-
Step 300
300
#F3AD9D
oklch(81% 0.086 33.3)
-
Step 400
400
#E97E68
oklch(70.8% 0.137 32.8)
-
Step 500
500
#DF573D
oklch(63.1% 0.175 32.8)
-
Step 600
600
#CB3518
oklch(55.7% 0.191 32.7)
-
Step 700
700 (this color)
#B42B10
oklch(50.6% 0.177 32.7)
-
Step 800
800
#8E220D
oklch(42.8% 0.147 32.8)
-
Step 900
900
#722314
oklch(37.7% 0.114 32.8)
-
Step 950
950
#43160D
oklch(27% 0.072 33.1)
#B42B10 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) | #564C08 | 0.188 |
| Deuteranopia (no green cones) | #786A02 | 0.169 |
| Tritanopia (no blue cones) | #C70027 | 0.050 |
| Achromatopsia (no color) | #5F5F5F | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B42B10
#B42B10
oklch(50.6% 0.177 32.7)
- #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 #B42B10, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.011
- Firebrick #B22222 ΔE 0.021
- Rufous #AE2012 ΔE 0.021
- Rust Red #AA2704 ΔE 0.023
- Scarlet #BE0119 ΔE 0.035
- Brown #A52A2A ΔE 0.038
- Sinopia #BB3E03 ΔE 0.038
- Brick #A03623 ΔE 0.040
Use #B42B10 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.