#B53318
Closest named color: Rusty Red (#AF2F0D). oklch(51.6% 0.171 33.3), rgb(181, 51, 24).
Aa
White text reads best on this color (6.08:1).
About this color
#B53318 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.171 and its hue 33°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.016 away. White text reads best on it, at 6.08:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.171) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.45:1 |
| White text | 6.08:1 |
Values
| HEX | #B53318 |
| RGB | rgb(181, 51, 24) |
| HSL | hsl(10, 77%, 40%) |
| OKLCH | oklch(51.6% 0.171 33.3) |
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 #B53318 | 6.08:1 | AA | Lc -84.4 | Fine for body text |
| Black text on #B53318 | 3.45:1 | AA large text | Lc 24.9 | Dividers and decoration only |
| #B53318 text on white | 6.08:1 | AA | Lc 79.1 | Fine for body text |
| #B53318 text on black | 3.45:1 | AA large text | Lc -22.7 | 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 700.
-
Step 50
50
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#F9E5E0
oklch(93.7% 0.023 34.3)
-
Step 200
200
#F6CFC6
oklch(88.5% 0.046 33.2)
-
Step 300
300
#F1AE9E
oklch(81% 0.082 33.9)
-
Step 400
400
#E77F69
oklch(70.7% 0.133 33)
-
Step 500
500
#DC5A3F
oklch(63% 0.169 33.4)
-
Step 600
600
#C8391C
oklch(55.6% 0.184 33.1)
-
Step 700
700 (this color)
#B53318
oklch(51.6% 0.171 33.3)
-
Step 800
800
#8C2510
oklch(42.7% 0.142 33.2)
-
Step 900
900
#702516
oklch(37.6% 0.11 33.2)
-
Step 950
950
#42170E
oklch(27% 0.069 33.5)
#B53318 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) | #5A5012 | 0.180 |
| Deuteranopia (no green cones) | #7A6D0F | 0.163 |
| Tritanopia (no blue cones) | #C8002E | 0.057 |
| Achromatopsia (no color) | #626262 | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B53318
#B53318
oklch(51.6% 0.171 33.3)
- #007587
#007587
oklch(51.7% 0.09 213.2)
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 #B53318, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.016
- Sinopia #BB3E03 ΔE 0.028
- Firebrick #B22222 ΔE 0.029
- Rufous #AE2012 ΔE 0.032
- Rust Red #AA2704 ΔE 0.032
- Dull Red #BB3F3F ΔE 0.040
- Brick #A03623 ΔE 0.042
- Russet #A13905 ΔE 0.042
Use #B53318 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.