#AC001B
Closest named color: Rufous (#AE2012). oklch(46.9% 0.19 24.7), rgb(172, 0, 27).
Aa
White text reads best on this color (7.58:1).
About this color
#AC001B is a medium-dark, vivid red. In OKLCH its lightness is 47%, its chroma 0.190 and its hue 25°. Its hue sits on the warm side of the wheel. The nearest named color is Rufous (#AE2012), ΔE 0.027 away. White text reads best on it, at 7.58:1.
| Hue family | Reds |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.190) |
| Temperature | warm |
| Nearest name | Rufous (#AE2012) |
| Black text | 2.76:1 |
| White text | 7.58:1 |
Values
| HEX | #AC001B |
| RGB | rgb(172, 0, 27) |
| HSL | hsl(351, 100%, 34%) |
| OKLCH | oklch(46.9% 0.19 24.7) |
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 #AC001B | 7.58:1 | AAA | Lc -88.7 | Fine for body text |
| Black text on #AC001B | 2.76:1 | Fails | Lc 20.3 | Dividers and decoration only |
| #AC001B text on white | 7.58:1 | AAA | Lc 83.7 | Fine for body text |
| #AC001B text on black | 2.76:1 | Fails | Lc -18.2 | 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
#FEF2F1
oklch(97% 0.013 23.2)
-
Step 100
100
#FBE3E1
oklch(93.5% 0.027 23.4)
-
Step 200
200
#F9CDC8
oklch(88.5% 0.05 25.7)
-
Step 300
300
#F7AAA3
oklch(81% 0.092 25.1)
-
Step 400
400
#EE7872
oklch(70.7% 0.147 24.5)
-
Step 500
500
#E54D4C
oklch(63.1% 0.189 24.6)
-
Step 600
600
#D0252F
oklch(55.6% 0.204 24.7)
-
Step 700
700 (this color)
#AC001B
oklch(46.9% 0.19 24.7)
-
Step 800
800
#92161E
oklch(42.7% 0.158 24.5)
-
Step 900
900
#751D1E
oklch(37.7% 0.122 24.7)
-
Step 950
950
#451312
oklch(27% 0.077 24.9)
#AC001B 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) | #463E19 | 0.210 |
| Deuteranopia (no green cones) | #6C6011 | 0.190 |
| Tritanopia (no blue cones) | #BE0010 | 0.039 |
| Achromatopsia (no color) | #545454 | 0.191 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AC001B
#AC001B
oklch(46.9% 0.19 24.7)
- #006770
#006770
oklch(46.9% 0.08 205.3)
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 #AC001B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rufous #AE2012 ΔE 0.027
- Firebrick #B22222 ΔE 0.030
- Rouge #AB1239 ΔE 0.032
- Brown #A52A2A ΔE 0.033
- Carmine #9D0216 ΔE 0.033
- Auburn #9B2226 ΔE 0.036
- Rust Red #AA2704 ΔE 0.037
- Burnt Red #9F2305 ΔE 0.039
Use #AC001B 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.