#42100B
Closest named color: Mahogany (#4A0100). oklch(25.9% 0.078 29.2), rgb(66, 16, 11).
Aa
White text reads best on this color (16.02:1).
About this color
#42100B is a dark, moderately saturated red. In OKLCH its lightness is 26%, its chroma 0.078 and its hue 29°. Its hue sits on the warm side of the wheel. The nearest named color is Mahogany (#4A0100), ΔE 0.026 away. White text reads best on it, at 16.02:1.
| Hue family | Reds |
| Lightness | dark (26%) |
| Chroma | moderately saturated (0.078) |
| Temperature | warm |
| Nearest name | Mahogany (#4A0100) |
| Black text | 1.31:1 |
| White text | 16.02:1 |
Values
| HEX | #42100B |
| RGB | rgb(66, 16, 11) |
| HSL | hsl(5, 71%, 15%) |
| OKLCH | oklch(25.9% 0.078 29.2) |
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 #42100B | 16.02:1 | AAA | Lc -105.1 | Preferred for body text |
| Black text on #42100B | 1.31:1 | Fails | Lc 0.0 | Not readable |
| #42100B text on white | 16.02:1 | AAA | Lc 102.4 | Preferred for body text |
| #42100B 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
#FEF3F1
oklch(97.2% 0.012 29.9)
-
Step 100
100
#FBE4E0
oklch(93.6% 0.026 29.4)
-
Step 200
200
#FACDC6
oklch(88.5% 0.052 28.5)
-
Step 300
300
#F7AA9E
oklch(80.9% 0.093 29.1)
-
Step 400
400
#EF7969
oklch(70.8% 0.148 29.3)
-
Step 500
500
#E54E3F
oklch(63% 0.19 29.1)
-
Step 600
600
#D1261C
oklch(55.6% 0.206 29.1)
-
Step 700
700
#B4130D
oklch(49% 0.192 29.1)
-
Step 800
800
#921710
oklch(42.6% 0.158 29.1)
-
Step 900
900
#761D15
oklch(37.8% 0.125 29.3)
-
Step 950
950 (this color)
#42100B
oklch(25.9% 0.078 29.2)
#42100B 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) | #1E1B0A | 0.083 |
| Deuteranopia (no green cones) | #2B2509 | 0.074 |
| Tritanopia (no blue cones) | #49030F | 0.026 |
| Achromatopsia (no color) | #212121 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42100B
#42100B
oklch(25.9% 0.078 29.2)
- #00292F
#00292F
oklch(25.7% 0.044 209.6)
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 #42100B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mahogany #4A0100 ΔE 0.026
- Deep Brown #410200 ΔE 0.026
- Chocolate Brown #411900 ΔE 0.029
- Dark Maroon #3C0008 ΔE 0.038
- Dark Brown #341C02 ΔE 0.047
- Dark Plum #3F012C ΔE 0.074
- Burgundy #610023 ΔE 0.081
- Aubergine #3D0734 ΔE 0.082
Use #42100B 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.