#AC451B
Closest named color: Burnt Umber (#A0450E). oklch(52.3% 0.145 40.4), rgb(172, 69, 27).
Aa
White text reads best on this color (5.79:1).
About this color
#AC451B is a medium-dark, vivid orange. In OKLCH its lightness is 52%, its chroma 0.145 and its hue 40°. Its hue sits on the warm side of the wheel. The nearest named color is Burnt Umber (#A0450E), ΔE 0.026 away. White text reads best on it, at 5.79:1.
| Hue family | Oranges |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.145) |
| Temperature | warm |
| Nearest name | Burnt Umber (#A0450E) |
| Black text | 3.62:1 |
| White text | 5.79:1 |
Values
| HEX | #AC451B |
| RGB | rgb(172, 69, 27) |
| HSL | hsl(17, 73%, 39%) |
| OKLCH | oklch(52.3% 0.145 40.4) |
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 #AC451B | 5.79:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #AC451B | 3.62:1 | AA large text | Lc 25.8 | Dividers and decoration only |
| #AC451B text on white | 5.79:1 | AA | Lc 78.2 | Fine for body text |
| #AC451B text on black | 3.62:1 | AA large text | Lc -23.6 | 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
#FBF3F1
oklch(97% 0.009 34.3)
-
Step 100
100
#F7E6E0
oklch(93.7% 0.02 40.5)
-
Step 200
200
#F1D1C6
oklch(88.5% 0.039 39.9)
-
Step 300
300
#E9B29E
oklch(80.9% 0.07 40.9)
-
Step 400
400
#DC8869
oklch(70.8% 0.112 40.9)
-
Step 500
500
#D06740
oklch(63.1% 0.143 40.4)
-
Step 600
600
#BB4B1C
oklch(55.5% 0.156 40.6)
-
Step 700
700 (this color)
#AC451B
oklch(52.3% 0.145 40.4)
-
Step 800
800
#833210
oklch(42.7% 0.12 40.5)
-
Step 900
900
#6A2D16
oklch(37.8% 0.094 40.3)
-
Step 950
950
#3E1B0E
oklch(27% 0.059 40.5)
#AC451B 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) | #625714 | 0.143 |
| Deuteranopia (no green cones) | #7C6E17 | 0.128 |
| Tritanopia (no blue cones) | #BD2B3D | 0.068 |
| Achromatopsia (no color) | #656565 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AC451B
#AC451B
oklch(52.3% 0.145 40.4)
- #007690
#007690
oklch(52.4% 0.096 220.3)
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 #AC451B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Burnt Umber #A0450E ΔE 0.026
- Cinnamon #AC4F06 ΔE 0.026
- Sinopia #BB3E03 ΔE 0.029
- Sienna #A0522D ΔE 0.032
- Russet #A13905 ΔE 0.036
- Rusty Red #AF2F0D ΔE 0.037
- Burnt Siena #B75203 ΔE 0.041
- Brick #A03623 ΔE 0.044
Use #AC451B 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.