#B5121E
Closest named color: Firebrick (#B22222). oklch(49.3% 0.192 25.7), rgb(181, 18, 30).
Aa
White text reads best on this color (6.84:1).
About this color
#B5121E is a medium-dark, vivid red. In OKLCH its lightness is 49%, its chroma 0.192 and its hue 26°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.013 away. White text reads best on it, at 6.84:1.
| Hue family | Reds |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.192) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.07:1 |
| White text | 6.84:1 |
Values
| HEX | #B5121E |
| RGB | rgb(181, 18, 30) |
| HSL | hsl(356, 82%, 39%) |
| OKLCH | oklch(49.3% 0.192 25.7) |
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 #B5121E | 6.84:1 | AA | Lc -86.6 | Fine for body text |
| Black text on #B5121E | 3.07:1 | AA large text | Lc 22.6 | Dividers and decoration only |
| #B5121E text on white | 6.84:1 | AA | Lc 81.5 | Fine for body text |
| #B5121E text on black | 3.07:1 | AA large text | Lc -20.4 | 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
#FEF2F1
oklch(97% 0.013 23.2)
-
Step 100
100
#FCE3E1
oklch(93.6% 0.028 23.2)
-
Step 200
200
#FACDC8
oklch(88.6% 0.052 25.6)
-
Step 300
300
#F7AAA2
oklch(81% 0.092 25.9)
-
Step 400
400
#EF786F
oklch(70.8% 0.148 25.9)
-
Step 500
500
#E54D49
oklch(63% 0.189 25.7)
-
Step 600
600
#D1242B
oklch(55.6% 0.206 25.7)
-
Step 700
700 (this color)
#B5121E
oklch(49.3% 0.192 25.7)
-
Step 800
800
#92151B
oklch(42.6% 0.158 25.5)
-
Step 900
900
#761C1C
oklch(37.8% 0.124 25.5)
-
Step 950
950
#451311
oklch(27% 0.077 26)
#B5121E 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) | #4D451C | 0.210 |
| Deuteranopia (no green cones) | #736615 | 0.190 |
| Tritanopia (no blue cones) | #C8001A | 0.038 |
| Achromatopsia (no color) | #5B5B5B | 0.193 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B5121E
#B5121E
oklch(49.3% 0.192 25.7)
- #006E78
#006E78
oklch(49.1% 0.084 205.8)
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 #B5121E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.013
- Scarlet #BE0119 ΔE 0.018
- Rufous #AE2012 ΔE 0.020
- Lipstick Red #C0022F ΔE 0.029
- Rust Red #AA2704 ΔE 0.034
- Brown #A52A2A ΔE 0.034
- Rusty Red #AF2F0D ΔE 0.036
- Rouge #AB1239 ΔE 0.038
Use #B5121E 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.