#B73538
Closest named color: Dull Red (#BB3F3F). oklch(52.5% 0.167 23.8), rgb(183, 53, 56).
Aa
White text reads best on this color (5.86:1).
About this color
#B73538 is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.167 and its hue 24°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.020 away. White text reads best on it, at 5.86:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.167) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.57:1 |
| White text | 5.86:1 |
Values
| HEX | #B73538 |
| RGB | rgb(183, 53, 56) |
| HSL | hsl(359, 55%, 46%) |
| OKLCH | oklch(52.5% 0.167 23.8) |
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 #B73538 | 5.86:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #B73538 | 3.57:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #B73538 text on white | 5.86:1 | AA | Lc 78.2 | Fine for body text |
| #B73538 text on black | 3.57:1 | AA large text | Lc -23.6 | 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
#FCF3F2
oklch(97.1% 0.01 25.1)
-
Step 100
100
#F8E5E3
oklch(93.7% 0.021 24.8)
-
Step 200
200
#F4CFCC
oklch(88.5% 0.042 23.5)
-
Step 300
300
#EDAEA9
oklch(80.8% 0.075 24)
-
Step 400
400
#E2817C
oklch(70.7% 0.12 23.7)
-
Step 500
500
#D65E5B
oklch(63.1% 0.152 23.9)
-
Step 600
600 (this color)
#B73538
oklch(52.5% 0.167 23.8)
-
Step 700
700
#A73033
oklch(49.2% 0.155 23.6)
-
Step 800
800
#87292A
oklch(42.6% 0.128 23.8)
-
Step 900
900
#6D2726
oklch(37.6% 0.1 24)
-
Step 950
950
#401817
oklch(27% 0.063 23.6)
#B73538 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) | #5A5337 | 0.179 |
| Deuteranopia (no green cones) | #7A6F34 | 0.166 |
| Tritanopia (no blue cones) | #C90638 | 0.047 |
| Achromatopsia (no color) | #656565 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B73538
#B73538
oklch(52.5% 0.167 23.8)
- #007982
#007982
oklch(52.5% 0.09 203.9)
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 #B73538, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.020
- Firebrick #B22222 ΔE 0.033
- Dusty Red #B9484E ΔE 0.037
- Rusty Red #AF2F0D ΔE 0.040
- Lipstick Red #C0022F ΔE 0.042
- Scarlet #BE0119 ΔE 0.044
- Rufous #AE2012 ΔE 0.045
- Brown #A52A2A ΔE 0.046
Use #B73538 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.