#B1091B
Closest named color: Firebrick (#B22222). oklch(48.2% 0.191 25.6), rgb(177, 9, 27).
Aa
White text reads best on this color (7.18:1).
About this color
#B1091B is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.191 and its hue 26°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.020 away. White text reads best on it, at 7.18:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.191) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 2.92:1 |
| White text | 7.18:1 |
Values
| HEX | #B1091B |
| RGB | rgb(177, 9, 27) |
| HSL | hsl(354, 90%, 36%) |
| OKLCH | oklch(48.2% 0.191 25.6) |
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 #B1091B | 7.18:1 | AAA | Lc -87.6 | Fine for body text |
| Black text on #B1091B | 2.92:1 | Fails | Lc 21.5 | Dividers and decoration only |
| #B1091B text on white | 7.18:1 | AAA | Lc 82.6 | Fine for body text |
| #B1091B text on black | 2.92:1 | Fails | Lc -19.3 | 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
#F7A9A2
oklch(80.8% 0.093 25)
-
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)
#B1091B
oklch(48.2% 0.191 25.6)
-
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)
#B1091B 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) | #4A4119 | 0.210 |
| Deuteranopia (no green cones) | #706311 | 0.190 |
| Tritanopia (no blue cones) | #C40015 | 0.039 |
| Achromatopsia (no color) | #575757 | 0.193 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B1091B
#B1091B
oklch(48.2% 0.191 25.6)
- #006B75
#006B75
oklch(48.2% 0.082 206.1)
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 #B1091B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.020
- Rufous #AE2012 ΔE 0.020
- Scarlet #BE0119 ΔE 0.027
- Brown #A52A2A ΔE 0.032
- Rust Red #AA2704 ΔE 0.033
- Rouge #AB1239 ΔE 0.034
- Lipstick Red #C0022F ΔE 0.037
- Rusty Red #AF2F0D ΔE 0.040
Use #B1091B 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.