#A10603
Closest named color: Carmine (#9D0216). oklch(44.7% 0.181 29.3), rgb(161, 6, 3).
Aa
White text reads best on this color (8.25:1).
About this color
#A10603 is a dark, vivid red. In OKLCH its lightness is 45%, its chroma 0.181 and its hue 29°. Its hue sits on the warm side of the wheel. The nearest named color is Carmine (#9D0216), ΔE 0.015 away. White text reads best on it, at 8.25:1.
| Hue family | Reds |
| Lightness | dark (45%) |
| Chroma | vivid (0.181) |
| Temperature | warm |
| Nearest name | Carmine (#9D0216) |
| Black text | 2.54:1 |
| White text | 8.25:1 |
Values
| HEX | #A10603 |
| RGB | rgb(161, 6, 3) |
| HSL | hsl(1, 96%, 32%) |
| OKLCH | oklch(44.7% 0.181 29.3) |
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 #A10603 | 8.25:1 | AAA | Lc -90.9 | Preferred for body text |
| Black text on #A10603 | 2.54:1 | Fails | Lc 17.9 | Dividers and decoration only |
| #A10603 text on white | 8.25:1 | AAA | Lc 86.1 | Fine for body text |
| #A10603 text on black | 2.54:1 | Fails | Lc -15.9 | 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 800.
-
Step 50
50
#FFF2F0
oklch(97.1% 0.014 28)
-
Step 100
100
#FEE3DE
oklch(93.6% 0.031 30.2)
-
Step 200
200
#FECBC3
oklch(88.5% 0.059 28.6)
-
Step 300
300
#FDA799
oklch(80.9% 0.105 29.7)
-
Step 400
400
#F87160
oklch(70.8% 0.169 29.2)
-
Step 500
500
#F03E30
oklch(63.1% 0.216 29.2)
-
Step 600
600
#D90100
oklch(55.6% 0.228 29.3)
-
Step 700
700
#B80100
oklch(49.2% 0.201 29.3)
-
Step 800
800 (this color)
#A10603
oklch(44.7% 0.181 29.3)
-
Step 900
900
#7B110B
oklch(37.6% 0.14 29.2)
-
Step 950
950
#490E09
oklch(27% 0.09 29.2)
#A10603 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) | #433A00 | 0.198 |
| Deuteranopia (no green cones) | #665A00 | 0.176 |
| Tritanopia (no blue cones) | #B2000B | 0.036 |
| Achromatopsia (no color) | #4E4E4E | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A10603
#A10603
oklch(44.7% 0.181 29.3)
- #00606C
#00606C
oklch(44.8% 0.077 209.6)
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 #A10603, closest first.
No curated palette has a color within ΔE 0.04 of #A10603.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carmine #9D0216 ΔE 0.015
- Deep Red #9A0200 ΔE 0.016
- Blood Red #980002 ΔE 0.021
- Burnt Red #9F2305 ΔE 0.024
- Auburn #9B2226 ΔE 0.028
- Brick Red #8F1402 ΔE 0.037
- Rufous #AE2012 ΔE 0.039
- Rust Red #AA2704 ΔE 0.040
Use #A10603 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.