#AC3F1B
Closest named color: Rusty Red (#AF2F0D). oklch(51.5% 0.151 37.6), rgb(172, 63, 27).
Aa
White text reads best on this color (6.03:1).
About this color
#AC3F1B is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.151 and its hue 38°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.025 away. White text reads best on it, at 6.03:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.151) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.48:1 |
| White text | 6.03:1 |
Values
| HEX | #AC3F1B |
| RGB | rgb(172, 63, 27) |
| HSL | hsl(15, 73%, 39%) |
| OKLCH | oklch(51.5% 0.151 37.6) |
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 #AC3F1B | 6.03:1 | AA | Lc -84.5 | Fine for body text |
| Black text on #AC3F1B | 3.48:1 | AA large text | Lc 24.8 | Dividers and decoration only |
| #AC3F1B text on white | 6.03:1 | AA | Lc 79.3 | Fine for body text |
| #AC3F1B text on black | 3.48:1 | AA large text | Lc -22.6 | 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
#FCF3F1
oklch(97.1% 0.01 32.5)
-
Step 100
100
#F7E5E0
oklch(93.5% 0.021 36)
-
Step 200
200
#F2D1C6
oklch(88.5% 0.04 39.3)
-
Step 300
300
#EBB19F
oklch(80.9% 0.073 37.9)
-
Step 400
400
#DF866B
oklch(70.8% 0.117 37.7)
-
Step 500
500
#D36442
oklch(63.1% 0.149 37.7)
-
Step 600
600
#BE4720
oklch(55.5% 0.161 37.6)
-
Step 700
700 (this color)
#AC3F1B
oklch(51.5% 0.151 37.6)
-
Step 800
800
#852F13
oklch(42.7% 0.125 37.5)
-
Step 900
900
#6B2B17
oklch(37.7% 0.097 37.7)
-
Step 950
950
#3F1A0F
oklch(27% 0.061 37.3)
#AC3F1B 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) | #5E5315 | 0.152 |
| Deuteranopia (no green cones) | #796C16 | 0.138 |
| Tritanopia (no blue cones) | #BE2138 | 0.065 |
| Achromatopsia (no color) | #636363 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AC3F1B
#AC3F1B
oklch(51.5% 0.151 37.6)
- #00748A
#00748A
oklch(51.5% 0.092 217.1)
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 #AC3F1B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.025
- Burnt Umber #A0450E ΔE 0.028
- Russet #A13905 ΔE 0.029
- Sinopia #BB3E03 ΔE 0.030
- Brick #A03623 ΔE 0.034
- Cinnamon #AC4F06 ΔE 0.038
- Rust Red #AA2704 ΔE 0.039
- Sienna #A0522D ΔE 0.041
Use #AC3F1B 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.