#B81700
Closest named color: Rufous (#AE2012). oklch(49.9% 0.194 31), rgb(184, 23, 0).
Aa
White text reads best on this color (6.64:1).
About this color
#B81700 is a medium-dark, vivid red. In OKLCH its lightness is 50%, its chroma 0.194 and its hue 31°. 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 6.64:1.
| Hue family | Reds |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.194) |
| Temperature | warm |
| Nearest name | Rufous (#AE2012) |
| Black text | 3.16:1 |
| White text | 6.64:1 |
Values
| HEX | #B81700 |
| RGB | rgb(184, 23, 0) |
| HSL | hsl(8, 100%, 36%) |
| OKLCH | oklch(49.9% 0.194 31) |
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 #B81700 | 6.64:1 | AA | Lc -85.9 | Fine for body text |
| Black text on #B81700 | 3.16:1 | AA large text | Lc 23.3 | Dividers and decoration only |
| #B81700 text on white | 6.64:1 | AA | Lc 80.7 | Fine for body text |
| #B81700 text on black | 3.16:1 | AA large text | Lc -21.1 | 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
#FEF3F0
oklch(97.2% 0.013 35.7)
-
Step 100
100
#FCE4DF
oklch(93.7% 0.027 31.7)
-
Step 200
200
#FACDC4
oklch(88.5% 0.053 31.3)
-
Step 300
300
#F7AA9C
oklch(80.9% 0.094 30.6)
-
Step 400
400
#EF7864
oklch(70.6% 0.151 31)
-
Step 500
500
#E64E38
oklch(63.1% 0.192 31.1)
-
Step 600
600
#D2250D
oklch(55.7% 0.209 31)
-
Step 700
700 (this color)
#B81700
oklch(49.9% 0.194 31)
-
Step 800
800
#931605
oklch(42.7% 0.161 31.1)
-
Step 900
900
#761D11
oklch(37.7% 0.125 31)
-
Step 950
950
#46130C
oklch(27.1% 0.08 30.7)
#B81700 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) | #514600 | 0.209 |
| Deuteranopia (no green cones) | #776900 | 0.186 |
| Tritanopia (no blue cones) | #CC0016 | 0.042 |
| Achromatopsia (no color) | #5C5C5C | 0.196 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B81700
#B81700
oklch(49.9% 0.194 31)
- #00707F
#00707F
oklch(50% 0.087 210.8)
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 #B81700, 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 0.020
- Scarlet #BE0119 ΔE 0.021
- Rusty Red #AF2F0D ΔE 0.027
- Rust Red #AA2704 ΔE 0.029
- Lipstick Red #C0022F ΔE 0.040
- Brown #A52A2A ΔE 0.043
- Burnt Red #9F2305 ΔE 0.050
Use #B81700 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.