#A9210C
Closest named color: Rust Red (#AA2704). oklch(47.7% 0.174 31.5), rgb(169, 33, 12).
Aa
White text reads best on this color (7.21:1).
About this color
#A9210C is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.174 and its hue 32°. Its hue sits on the warm side of the wheel. The nearest named color is Rust Red (#AA2704), ΔE 0.010 away. White text reads best on it, at 7.21:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.174) |
| Temperature | warm |
| Nearest name | Rust Red (#AA2704) |
| Black text | 2.90:1 |
| White text | 7.21:1 |
Values
| HEX | #A9210C |
| RGB | rgb(169, 33, 12) |
| HSL | hsl(8, 87%, 35%) |
| OKLCH | oklch(47.7% 0.174 31.5) |
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 #A9210C | 7.21:1 | AAA | Lc -88.4 | Fine for body text |
| Black text on #A9210C | 2.90:1 | Fails | Lc 20.6 | Dividers and decoration only |
| #A9210C text on white | 7.21:1 | AAA | Lc 83.4 | Fine for body text |
| #A9210C text on black | 2.90:1 | Fails | Lc -18.5 | 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
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#FAE4E0
oklch(93.6% 0.025 29.9)
-
Step 200
200
#F7CFC6
oklch(88.6% 0.047 32.8)
-
Step 300
300
#F2AD9F
oklch(80.9% 0.084 31.8)
-
Step 400
400
#E87E6B
oklch(70.7% 0.135 31.3)
-
Step 500
500
#DE5842
oklch(63.1% 0.172 31.6)
-
Step 600
600
#C93620
oklch(55.5% 0.187 31.5)
-
Step 700
700 (this color)
#A9210C
oklch(47.7% 0.174 31.5)
-
Step 800
800
#8D2313
oklch(42.7% 0.144 31.6)
-
Step 900
900
#712317
oklch(37.6% 0.113 31.4)
-
Step 950
950
#43160F
oklch(27% 0.072 31.1)
#A9210C 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) | #4E4405 | 0.186 |
| Deuteranopia (no green cones) | #6F6200 | 0.168 |
| Tritanopia (no blue cones) | #BB001F | 0.042 |
| Achromatopsia (no color) | #575757 | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A9210C
#A9210C
oklch(47.7% 0.174 31.5)
- #006978
#006978
oklch(47.8% 0.083 211.7)
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 #A9210C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rust Red #AA2704 ΔE 0.010
- Rufous #AE2012 ΔE 0.011
- Burnt Red #9F2305 ΔE 0.021
- Brown #A52A2A ΔE 0.023
- Firebrick #B22222 ΔE 0.025
- Rusty Red #AF2F0D ΔE 0.025
- Brick #A03623 ΔE 0.031
- Auburn #9B2226 ΔE 0.035
Use #A9210C 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.