#B00018
Closest named color: Rufous (#AE2012). oklch(47.7% 0.194 25.6), rgb(176, 0, 24).
Aa
White text reads best on this color (7.34:1).
About this color
#B00018 is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.194 and its hue 26°. Its hue sits on the warm side of the wheel. The nearest named color is Rufous (#AE2012), ΔE 0.023 away. White text reads best on it, at 7.34:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.194) |
| Temperature | warm |
| Nearest name | Rufous (#AE2012) |
| Black text | 2.85:1 |
| White text | 7.34:1 |
Values
| HEX | #B00018 |
| RGB | rgb(176, 0, 24) |
| HSL | hsl(352, 100%, 35%) |
| OKLCH | oklch(47.7% 0.194 25.6) |
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 #B00018 | 7.34:1 | AAA | Lc -87.9 | Fine for body text |
| Black text on #B00018 | 2.85:1 | Fails | Lc 21.2 | Dividers and decoration only |
| #B00018 text on white | 7.34:1 | AAA | Lc 82.8 | Fine for body text |
| #B00018 text on black | 2.85:1 | Fails | Lc -19.1 | 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
#FEF2F1
oklch(97% 0.013 23.2)
-
Step 100
100
#FCE3E1
oklch(93.6% 0.028 23.2)
-
Step 200
200
#FACDC8
oklch(88.6% 0.052 25.6)
-
Step 300
300
#F7A9A1
oklch(80.8% 0.093 25.8)
-
Step 400
400
#EF776F
oklch(70.6% 0.149 25.5)
-
Step 500
500
#E64C48
oklch(63.1% 0.191 25.8)
-
Step 600
600
#D2222A
oklch(55.7% 0.208 25.7)
-
Step 700
700 (this color)
#B00018
oklch(47.7% 0.194 25.6)
-
Step 800
800
#93141A
oklch(42.7% 0.16 25.7)
-
Step 900
900
#761C1B
oklch(37.7% 0.125 26)
-
Step 950
950
#461211
oklch(27% 0.08 25.2)
#B00018 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) | #484016 | 0.214 |
| Deuteranopia (no green cones) | #6E620C | 0.194 |
| Tritanopia (no blue cones) | #C3000F | 0.041 |
| Achromatopsia (no color) | #565656 | 0.195 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B00018
#B00018
oklch(47.7% 0.194 25.6)
- #006973
#006973
oklch(47.6% 0.081 206.2)
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 #B00018, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rufous #AE2012 ΔE 0.023
- Firebrick #B22222 ΔE 0.025
- Scarlet #BE0119 ΔE 0.030
- Brown #A52A2A ΔE 0.034
- Rouge #AB1239 ΔE 0.035
- Rust Red #AA2704 ΔE 0.035
- Lipstick Red #C0022F ΔE 0.040
- Carmine #9D0216 ΔE 0.041
Use #B00018 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.