#AD1900
Closest named color: Rufous (#AE2012). oklch(47.9% 0.184 31.6), rgb(173, 25, 0).
Aa
White text reads best on this color (7.20:1).
About this color
#AD1900 is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.184 and its hue 32°. Its hue sits on the warm side of the wheel. The nearest named color is Rufous (#AE2012), ΔE 0.010 away. White text reads best on it, at 7.20:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.184) |
| Temperature | warm |
| Nearest name | Rufous (#AE2012) |
| Black text | 2.91:1 |
| White text | 7.20:1 |
Values
| HEX | #AD1900 |
| RGB | rgb(173, 25, 0) |
| HSL | hsl(9, 100%, 34%) |
| OKLCH | oklch(47.9% 0.184 31.6) |
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 #AD1900 | 7.20:1 | AAA | Lc -88.1 | Fine for body text |
| Black text on #AD1900 | 2.91:1 | Fails | Lc 21.0 | Dividers and decoration only |
| #AD1900 text on white | 7.20:1 | AAA | Lc 83.0 | Fine for body text |
| #AD1900 text on black | 2.91:1 | Fails | Lc -18.9 | 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
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#FBE4DF
oklch(93.6% 0.026 32.2)
-
Step 200
200
#F8CEC5
oklch(88.5% 0.049 32.1)
-
Step 300
300
#F4AC9D
oklch(80.9% 0.088 32.1)
-
Step 400
400
#EB7C67
oklch(70.7% 0.141 32)
-
Step 500
500
#E2533D
oklch(63.1% 0.182 31.3)
-
Step 600
600
#CD2F17
oklch(55.5% 0.197 31.6)
-
Step 700
700 (this color)
#AD1900
oklch(47.9% 0.184 31.6)
-
Step 800
800
#901E0C
oklch(42.8% 0.152 31.7)
-
Step 900
900
#742114
oklch(37.8% 0.119 31.7)
-
Step 950
950
#44150D
oklch(27% 0.075 31.9)
#AD1900 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) | #4D4300 | 0.197 |
| Deuteranopia (no green cones) | #706300 | 0.176 |
| Tritanopia (no blue cones) | #BF0017 | 0.039 |
| Achromatopsia (no color) | #575757 | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AD1900
#AD1900
oklch(47.9% 0.184 31.6)
- #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 #AD1900, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rufous #AE2012 ΔE 0.010
- Rust Red #AA2704 ΔE 0.015
- Firebrick #B22222 ΔE 0.024
- Rusty Red #AF2F0D ΔE 0.027
- Burnt Red #9F2305 ΔE 0.028
- Brown #A52A2A ΔE 0.030
- Scarlet #BE0119 ΔE 0.038
- Brick #A03623 ΔE 0.040
Use #AD1900 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.