#B21600
Closest named color: Rufous (#AE2012). oklch(48.7% 0.19 31.1), rgb(178, 22, 0).
Aa
White text reads best on this color (6.98:1).
About this color
#B21600 is a medium-dark, vivid red. In OKLCH its lightness is 49%, its chroma 0.190 and its hue 31°. Its hue sits on the warm side of the wheel. The nearest named color is Rufous (#AE2012), ΔE 0.011 away. White text reads best on it, at 6.98:1.
| Hue family | Reds |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.190) |
| Temperature | warm |
| Nearest name | Rufous (#AE2012) |
| Black text | 3.00:1 |
| White text | 6.98:1 |
Values
| HEX | #B21600 |
| RGB | rgb(178, 22, 0) |
| HSL | hsl(7, 100%, 35%) |
| OKLCH | oklch(48.7% 0.19 31.1) |
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 #B21600 | 6.98:1 | AA | Lc -87.2 | Fine for body text |
| Black text on #B21600 | 3.00:1 | AA large text | Lc 22.0 | Dividers and decoration only |
| #B21600 text on white | 6.98:1 | AA | Lc 82.1 | Fine for body text |
| #B21600 text on black | 3.00:1 | AA large text | Lc -19.8 | 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
#FBE4DF
oklch(93.6% 0.026 32.2)
-
Step 200
200
#F9CDC5
oklch(88.4% 0.051 30.1)
-
Step 300
300
#F6AB9C
oklch(80.9% 0.092 31.7)
-
Step 400
400
#EE7A66
oklch(70.8% 0.147 31.2)
-
Step 500
500
#E4503B
oklch(63% 0.187 30.9)
-
Step 600
600
#D02A13
oklch(55.7% 0.204 31.2)
-
Step 700
700 (this color)
#B21600
oklch(48.7% 0.19 31.1)
-
Step 800
800
#921A0A
oklch(42.8% 0.157 31)
-
Step 900
900
#751F13
oklch(37.8% 0.122 31.1)
-
Step 950
950
#45140C
oklch(27% 0.077 31.7)
#B21600 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) | #4E4400 | 0.204 |
| Deuteranopia (no green cones) | #736500 | 0.181 |
| Tritanopia (no blue cones) | #C50015 | 0.040 |
| Achromatopsia (no color) | #595959 | 0.191 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B21600
#B21600
oklch(48.7% 0.19 31.1)
- #006C7B
#006C7B
oklch(48.7% 0.085 211.3)
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 #B21600, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rufous #AE2012 ΔE 0.011
- Firebrick #B22222 ΔE 0.019
- Rust Red #AA2704 ΔE 0.020
- Rusty Red #AF2F0D ΔE 0.026
- Scarlet #BE0119 ΔE 0.029
- Brown #A52A2A ΔE 0.035
- Burnt Red #9F2305 ΔE 0.038
- Brick #A03623 ΔE 0.046
Use #B21600 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.