#B00000
Closest named color: Rufous (#AE2012). oklch(47.5% 0.195 29.2), rgb(176, 0, 0).
Aa
White text reads best on this color (7.37:1).
About this color
#B00000 is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.195 and its hue 29°. Its hue sits on the warm side of the wheel. The nearest named color is Rufous (#AE2012), ΔE 0.020 away. White text reads best on it, at 7.37:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.195) |
| Temperature | warm |
| Nearest name | Rufous (#AE2012) |
| Black text | 2.84:1 |
| White text | 7.37:1 |
Values
| HEX | #B00000 |
| RGB | rgb(176, 0, 0) |
| HSL | hsl(0, 100%, 35%) |
| OKLCH | oklch(47.5% 0.195 29.2) |
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 #B00000 | 7.37:1 | AAA | Lc -87.9 | Fine for body text |
| Black text on #B00000 | 2.84:1 | Fails | Lc 21.1 | Dividers and decoration only |
| #B00000 text on white | 7.37:1 | AAA | Lc 82.9 | Fine for body text |
| #B00000 text on black | 2.84:1 | Fails | Lc -19.0 | 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
#FEF3F1
oklch(97.2% 0.012 29.9)
-
Step 100
100
#FCE4DF
oklch(93.7% 0.027 31.7)
-
Step 200
200
#FACDC5
oklch(88.5% 0.052 29.9)
-
Step 300
300
#F8AA9D
oklch(81% 0.095 29.7)
-
Step 400
400
#F07868
oklch(70.8% 0.151 29.2)
-
Step 500
500
#E74D3D
oklch(63.2% 0.193 29.4)
-
Step 600
600
#D22218
oklch(55.5% 0.21 29.3)
-
Step 700
700 (this color)
#B00000
oklch(47.5% 0.195 29.2)
-
Step 800
800
#93140D
oklch(42.6% 0.161 29.2)
-
Step 900
900
#761C14
oklch(37.6% 0.126 29.4)
-
Step 950
950
#46130D
oklch(27.1% 0.08 29.8)
#B00000 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) | #493F00 | 0.213 |
| Deuteranopia (no green cones) | #6F6200 | 0.189 |
| Tritanopia (no blue cones) | #C30007 | 0.041 |
| Achromatopsia (no color) | #565656 | 0.196 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B00000
#B00000
oklch(47.5% 0.195 29.2)
- #006975
#006975
oklch(47.7% 0.082 208.5)
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 #B00000, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rufous #AE2012 ΔE 0.020
- Firebrick #B22222 ΔE 0.027
- Rust Red #AA2704 ΔE 0.029
- Scarlet #BE0119 ΔE 0.033
- Burnt Red #9F2305 ΔE 0.037
- Brown #A52A2A ΔE 0.038
- Rusty Red #AF2F0D ΔE 0.040
- Carmine #9D0216 ΔE 0.043
Use #B00000 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.