#40001F
Closest named color: Dark Plum (#3F012C). oklch(24.1% 0.098 358.4), rgb(64, 0, 31).
Aa
White text reads best on this color (16.96:1).
About this color
#40001F is a very dark, moderately saturated red. In OKLCH its lightness is 24%, its chroma 0.098 and its hue 358°. Its hue sits on the warm side of the wheel. The nearest named color is Dark Plum (#3F012C), ΔE 0.025 away. White text reads best on it, at 16.96:1.
| Hue family | Reds |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.098) |
| Temperature | warm |
| Nearest name | Dark Plum (#3F012C) |
| Black text | 1.23:1 |
| White text | 16.96:1 |
Values
| HEX | #40001F |
| RGB | rgb(64, 0, 31) |
| HSL | hsl(331, 100%, 13%) |
| OKLCH | oklch(24.1% 0.098 358.4) |
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 #40001F | 16.96:1 | AAA | Lc -105.4 | Preferred for body text |
| Black text on #40001F | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #40001F text on white | 16.96:1 | AAA | Lc 102.8 | Preferred for body text |
| #40001F text on black | 1.23:1 | Fails | Lc 0.0 | Not readable |
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 950.
-
Step 50
50
#FFF1F5
oklch(97% 0.016 358)
-
Step 100
100
#FEE1E9
oklch(93.6% 0.033 359.2)
-
Step 200
200
#FEC8D9
oklch(88.5% 0.065 357.8)
-
Step 300
300
#FEA0C0
oklch(80.9% 0.117 358.1)
-
Step 400
400
#F7669F
oklch(70.7% 0.185 358.4)
-
Step 500
500
#EF2788
oklch(63.1% 0.238 358.3)
-
Step 600
600
#D00072
oklch(55.7% 0.227 358.4)
-
Step 700
700
#B0005F
oklch(49.1% 0.2 358.6)
-
Step 800
800
#91004E
oklch(42.7% 0.174 358.2)
-
Step 900
900
#7A0041
oklch(37.7% 0.153 358)
-
Step 950
950 (this color)
#40001F
oklch(24.1% 0.098 358.4)
#40001F 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) | #101420 | 0.112 |
| Deuteranopia (no green cones) | #22211E | 0.099 |
| Tritanopia (no blue cones) | #46000E | 0.035 |
| Achromatopsia (no color) | #1C1C1C | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40001F
#40001F
oklch(24.1% 0.098 358.4)
- #002620
#002620
oklch(24.1% 0.044 179.7)
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 #40001F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Plum #3F012C ΔE 0.025
- Aubergine #3D0734 ΔE 0.040
- Dark Maroon #3C0008 ΔE 0.040
- Eggplant #380835 ΔE 0.046
- Deep Brown #410200 ΔE 0.053
- Mahogany #4A0100 ΔE 0.058
- Eggplant Purple #430541 ΔE 0.063
- Dark Purple #35063E ΔE 0.066
Use #40001F 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.