#A6421B
Closest named color: Burnt Umber (#A0450E). oklch(50.9% 0.141 39.9), rgb(166, 66, 27).
Aa
White text reads best on this color (6.14:1).
About this color
#A6421B is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.141 and its hue 40°. Its hue sits on the warm side of the wheel. The nearest named color is Burnt Umber (#A0450E), ΔE 0.016 away. White text reads best on it, at 6.14:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.141) |
| Temperature | warm |
| Nearest name | Burnt Umber (#A0450E) |
| Black text | 3.41:1 |
| White text | 6.14:1 |
Values
| HEX | #A6421B |
| RGB | rgb(166, 66, 27) |
| HSL | hsl(17, 72%, 38%) |
| OKLCH | oklch(50.9% 0.141 39.9) |
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 #A6421B | 6.14:1 | AA | Lc -85.1 | Fine for body text |
| Black text on #A6421B | 3.41:1 | AA large text | Lc 24.2 | Dividers and decoration only |
| #A6421B text on white | 6.14:1 | AA | Lc 79.9 | Fine for body text |
| #A6421B text on black | 3.41:1 | AA large text | Lc -21.9 | 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
#FBF4F1
oklch(97.2% 0.009 44.9)
-
Step 100
100
#F6E6E0
oklch(93.6% 0.019 41.8)
-
Step 200
200
#F1D1C7
oklch(88.5% 0.039 38.1)
-
Step 300
300
#E8B2A0
oklch(80.8% 0.068 39.2)
-
Step 400
400
#DB886C
oklch(70.7% 0.11 39.4)
-
Step 500
500
#CF6843
oklch(63.2% 0.14 40)
-
Step 600
600
#BA4C22
oklch(55.6% 0.152 39.7)
-
Step 700
700 (this color)
#A6421B
oklch(50.9% 0.141 39.9)
-
Step 800
800
#823314
oklch(42.8% 0.117 40.1)
-
Step 900
900
#692E18
oklch(37.8% 0.091 40.3)
-
Step 950
950
#3E1B0F
oklch(27% 0.059 39.4)
#A6421B 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) | #5E5415 | 0.140 |
| Deuteranopia (no green cones) | #776A17 | 0.126 |
| Tritanopia (no blue cones) | #B7293A | 0.065 |
| Achromatopsia (no color) | #616161 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A6421B
#A6421B
oklch(50.9% 0.141 39.9)
- #00728A
#00728A
oklch(51% 0.092 219.2)
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 #A6421B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Burnt Umber #A0450E ΔE 0.016
- Russet #A13905 ΔE 0.023
- Brick #A03623 ΔE 0.031
- Rusty Red #AF2F0D ΔE 0.033
- Sienna #A0522D ΔE 0.033
- Cinnamon #AC4F06 ΔE 0.036
- Sinopia #BB3E03 ΔE 0.041
- Rust Red #AA2704 ΔE 0.043
Use #A6421B 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.