#B52505
Closest named color: Rusty Red (#AF2F0D). oklch(50.3% 0.183 32.7), rgb(181, 37, 5).
Aa
White text reads best on this color (6.49:1).
About this color
#B52505 is a medium-dark, vivid red. In OKLCH its lightness is 50%, its chroma 0.183 and its hue 33°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.015 away. White text reads best on it, at 6.49:1.
| Hue family | Reds |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.183) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.23:1 |
| White text | 6.49:1 |
Values
| HEX | #B52505 |
| RGB | rgb(181, 37, 5) |
| HSL | hsl(11, 95%, 36%) |
| OKLCH | oklch(50.3% 0.183 32.7) |
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 #B52505 | 6.49:1 | AA | Lc -85.7 | Fine for body text |
| Black text on #B52505 | 3.23:1 | AA large text | Lc 23.5 | Dividers and decoration only |
| #B52505 text on white | 6.49:1 | AA | Lc 80.5 | Fine for body text |
| #B52505 text on black | 3.23:1 | AA large text | Lc -21.3 | 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
#FDF3F0
oklch(97.1% 0.012 37.4)
-
Step 100
100
#FBE4DF
oklch(93.6% 0.026 32.2)
-
Step 200
200
#F8CEC5
oklch(88.5% 0.049 32.1)
-
Step 300
300
#F4AC9C
oklch(80.9% 0.088 33)
-
Step 400
400
#EB7C65
oklch(70.7% 0.142 32.9)
-
Step 500
500
#E25439
oklch(63.1% 0.182 32.8)
-
Step 600
600
#CD3010
oklch(55.6% 0.197 32.7)
-
Step 700
700 (this color)
#B52505
oklch(50.3% 0.183 32.7)
-
Step 800
800
#901E07
oklch(42.7% 0.153 32.7)
-
Step 900
900
#732112
oklch(37.6% 0.118 32.6)
-
Step 950
950
#44150C
oklch(27% 0.075 32.8)
#B52505 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) | #544A00 | 0.196 |
| Deuteranopia (no green cones) | #776900 | 0.174 |
| Tritanopia (no blue cones) | #C80021 | 0.046 |
| Achromatopsia (no color) | #5E5E5E | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B52505
#B52505
oklch(50.3% 0.183 32.7)
- #007182
#007182
oklch(50.4% 0.088 212.7)
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 #B52505, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.015
- Rufous #AE2012 ΔE 0.019
- Firebrick #B22222 ΔE 0.020
- Rust Red #AA2704 ΔE 0.022
- Scarlet #BE0119 ΔE 0.031
- Brown #A52A2A ΔE 0.039
- Sinopia #BB3E03 ΔE 0.042
- Brick #A03623 ΔE 0.043
Use #B52505 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.