#C42B10
Closest named color: Sinopia (#BB3E03). oklch(53.5% 0.192 32.1), rgb(196, 43, 16).
Aa
White text reads best on this color (5.67:1).
About this color
#C42B10 is a medium-dark, vivid red. In OKLCH its lightness is 54%, its chroma 0.192 and its hue 32°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.032 away. White text reads best on it, at 5.67:1.
| Hue family | Reds |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.192) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.70:1 |
| White text | 5.67:1 |
Values
| HEX | #C42B10 |
| RGB | rgb(196, 43, 16) |
| HSL | hsl(9, 85%, 42%) |
| OKLCH | oklch(53.5% 0.192 32.1) |
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 #C42B10 | 5.67:1 | AA | Lc -82.1 | Fine for body text |
| Black text on #C42B10 | 3.70:1 | AA large text | Lc 27.3 | Dividers and decoration only |
| #C42B10 text on white | 5.67:1 | AA | Lc 76.7 | Fine for body text |
| #C42B10 text on black | 3.70:1 | AA large text | Lc -25.0 | 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 600.
-
Step 50
50
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#FAE4E0
oklch(93.6% 0.025 29.9)
-
Step 200
200
#F7CEC6
oklch(88.4% 0.048 30.9)
-
Step 300
300
#F3AC9E
oklch(80.8% 0.087 31.5)
-
Step 400
400
#EA7D68
oklch(70.7% 0.139 32.1)
-
Step 500
500
#E0563E
oklch(63.1% 0.177 32.1)
-
Step 600
600 (this color)
#C42B10
oklch(53.5% 0.192 32.1)
-
Step 700
700
#AF230A
oklch(49% 0.179 32)
-
Step 800
800
#8E210E
oklch(42.7% 0.148 32.2)
-
Step 900
900
#722215
oklch(37.6% 0.115 31.8)
-
Step 950
950
#43160D
oklch(27% 0.072 33.1)
#C42B10 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) | #5D5107 | 0.204 |
| Deuteranopia (no green cones) | #827300 | 0.185 |
| Tritanopia (no blue cones) | #D90028 | 0.050 |
| Achromatopsia (no color) | #676767 | 0.194 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C42B10
#C42B10
oklch(53.5% 0.192 32.1)
- #007B8D
#007B8D
oklch(53.5% 0.093 212.4)
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 #C42B10, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.032
- Scarlet #BE0119 ΔE 0.039
- Dull Red #BB3F3F ΔE 0.042
- Rusty Red #AF2F0D ΔE 0.042
- Firebrick #B22222 ΔE 0.044
- Lipstick Red #C0022F ΔE 0.048
- Cherry #CF0234 ΔE 0.048
- Brick Orange #C14A09 ΔE 0.049
Use #C42B10 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.