#B51F22
Closest named color: Firebrick (#B22222). oklch(50% 0.184 26.4), rgb(181, 31, 34).
Aa
White text reads best on this color (6.59:1).
About this color
#B51F22 is a medium-dark, vivid red. In OKLCH its lightness is 50%, its chroma 0.184 and its hue 26°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.006 away. White text reads best on it, at 6.59:1.
| Hue family | Reds |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.184) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.18:1 |
| White text | 6.59:1 |
Values
| HEX | #B51F22 |
| RGB | rgb(181, 31, 34) |
| HSL | hsl(359, 71%, 42%) |
| OKLCH | oklch(50% 0.184 26.4) |
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 #B51F22 | 6.59:1 | AA | Lc -86.0 | Fine for body text |
| Black text on #B51F22 | 3.18:1 | AA large text | Lc 23.2 | Dividers and decoration only |
| #B51F22 text on white | 6.59:1 | AA | Lc 80.9 | Fine for body text |
| #B51F22 text on black | 3.18:1 | AA large text | Lc -21.0 | 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
#FBE4E1
oklch(93.7% 0.026 26.5)
-
Step 200
200
#F8CDC8
oklch(88.4% 0.049 25.9)
-
Step 300
300
#F5ABA2
oklch(81% 0.089 26.9)
-
Step 400
400
#EC7A70
oklch(70.7% 0.142 26.5)
-
Step 500
500
#E3514A
oklch(63.2% 0.183 26.4)
-
Step 600
600
#CE2B2C
oklch(55.6% 0.199 26.4)
-
Step 700
700 (this color)
#B51F22
oklch(50% 0.184 26.4)
-
Step 800
800
#901B1C
oklch(42.7% 0.152 26.3)
-
Step 900
900
#741F1C
oklch(37.7% 0.119 26.6)
-
Step 950
950
#441411
oklch(26.9% 0.075 26.9)
#B51F22 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) | #514820 | 0.200 |
| Deuteranopia (no green cones) | #75681A | 0.182 |
| Tritanopia (no blue cones) | #C80023 | 0.038 |
| Achromatopsia (no color) | #5D5D5D | 0.186 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B51F22
#B51F22
oklch(50% 0.184 26.4)
- #00717C
#00717C
oklch(50.1% 0.086 206.6)
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 #B51F22, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.006
- Rufous #AE2012 ΔE 0.019
- Scarlet #BE0119 ΔE 0.021
- Rusty Red #AF2F0D ΔE 0.029
- Lipstick Red #C0022F ΔE 0.030
- Rust Red #AA2704 ΔE 0.031
- Brown #A52A2A ΔE 0.032
- Rose Red #BE013C ΔE 0.041
Use #B51F22 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.