#42100F
Closest named color: Mahogany (#4A0100). oklch(25.9% 0.078 25.3), rgb(66, 16, 15).
Aa
White text reads best on this color (15.99:1).
About this color
#42100F is a dark, moderately saturated red. In OKLCH its lightness is 26%, its chroma 0.078 and its hue 25°. Its hue sits on the warm side of the wheel. The nearest named color is Mahogany (#4A0100), ΔE 0.028 away. White text reads best on it, at 15.99:1.
| Hue family | Reds |
| Lightness | dark (26%) |
| Chroma | moderately saturated (0.078) |
| Temperature | warm |
| Nearest name | Mahogany (#4A0100) |
| Black text | 1.31:1 |
| White text | 15.99:1 |
Values
| HEX | #42100F |
| RGB | rgb(66, 16, 15) |
| HSL | hsl(1, 63%, 16%) |
| OKLCH | oklch(25.9% 0.078 25.3) |
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 #42100F | 15.99:1 | AAA | Lc -105.1 | Preferred for body text |
| Black text on #42100F | 1.31:1 | Fails | Lc 0.0 | Not readable |
| #42100F text on white | 15.99:1 | AAA | Lc 102.4 | Preferred for body text |
| #42100F text on black | 1.31:1 | 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
#FEF2F1
oklch(97% 0.013 23.2)
-
Step 100
100
#FBE4E1
oklch(93.7% 0.026 26.5)
-
Step 200
200
#F9CDC8
oklch(88.5% 0.05 25.7)
-
Step 300
300
#F6AAA2
oklch(80.9% 0.091 25.9)
-
Step 400
400
#EE7870
oklch(70.7% 0.147 25.5)
-
Step 500
500
#E54E4B
oklch(63.2% 0.188 25.3)
-
Step 600
600
#D0262D
oklch(55.6% 0.204 25.4)
-
Step 700
700
#B41320
oklch(49.2% 0.19 25.3)
-
Step 800
800
#92171C
oklch(42.7% 0.157 25.5)
-
Step 900
900
#751D1D
oklch(37.7% 0.122 25.2)
-
Step 950
950 (this color)
#42100F
oklch(25.9% 0.078 25.3)
#42100F 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) | #1E1B0E | 0.083 |
| Deuteranopia (no green cones) | #2A260E | 0.077 |
| Tritanopia (no blue cones) | #490410 | 0.023 |
| Achromatopsia (no color) | #222222 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42100F
#42100F
oklch(25.9% 0.078 25.3)
- #002A2E
#002A2E
oklch(26% 0.044 204.6)
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 #42100F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mahogany #4A0100 ΔE 0.028
- Deep Brown #410200 ΔE 0.028
- Chocolate Brown #411900 ΔE 0.033
- Dark Maroon #3C0008 ΔE 0.037
- Dark Brown #341C02 ΔE 0.050
- Dark Plum #3F012C ΔE 0.068
- Aubergine #3D0734 ΔE 0.076
- Burgundy #610023 ΔE 0.079
Use #42100F 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.