#900B10
Closest named color: Brick Red (#8F1402). oklch(41.6% 0.163 27.2), rgb(144, 11, 16).
Aa
White text reads best on this color (9.36:1).
About this color
#900B10 is a dark, vivid red. In OKLCH its lightness is 42%, its chroma 0.163 and its hue 27°. Its hue sits on the warm side of the wheel. The nearest named color is Brick Red (#8F1402), ΔE 0.013 away. White text reads best on it, at 9.36:1.
| Hue family | Reds |
| Lightness | dark (42%) |
| Chroma | vivid (0.163) |
| Temperature | warm |
| Nearest name | Brick Red (#8F1402) |
| Black text | 2.24:1 |
| White text | 9.36:1 |
Values
| HEX | #900B10 |
| RGB | rgb(144, 11, 16) |
| HSL | hsl(358, 86%, 30%) |
| OKLCH | oklch(41.6% 0.163 27.2) |
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 #900B10 | 9.36:1 | AAA | Lc -94.1 | Preferred for body text |
| Black text on #900B10 | 2.24:1 | Fails | Lc 14.4 | Not readable |
| #900B10 text on white | 9.36:1 | AAA | Lc 89.6 | Fine for body text |
| #900B10 text on black | 2.24:1 | Fails | Lc -12.6 | Not readable |
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
#FEF2F1
oklch(97% 0.013 23.2)
-
Step 100
100
#FCE3E0
oklch(93.5% 0.028 25.9)
-
Step 200
200
#FACDC6
oklch(88.5% 0.052 28.5)
-
Step 300
300
#F8A99F
oklch(80.9% 0.095 27.3)
-
Step 400
400
#F0776B
oklch(70.7% 0.151 27.3)
-
Step 500
500
#E74B43
oklch(63% 0.194 27.1)
-
Step 600
600
#D31F22
oklch(55.6% 0.211 27.1)
-
Step 700
700
#B60814
oklch(49.1% 0.197 27.1)
-
Step 800
800 (this color)
#900B10
oklch(41.6% 0.163 27.2)
-
Step 900
900
#771B18
oklch(37.8% 0.127 27.2)
-
Step 950
950
#46120F
oklch(27% 0.08 27.1)
#900B10 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) | #3C350E | 0.178 |
| Deuteranopia (no green cones) | #5B5006 | 0.160 |
| Tritanopia (no blue cones) | #9F0010 | 0.031 |
| Achromatopsia (no color) | #464646 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #900B10
#900B10
oklch(41.6% 0.163 27.2)
- #005660
#005660
oklch(41.5% 0.071 208.4)
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 #900B10, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brick Red #8F1402 ΔE 0.013
- Dark Red #8B0000 ΔE 0.017
- Blood Red #980002 ΔE 0.017
- Deep Red #9A0200 ΔE 0.022
- Carmine #9D0216 ΔE 0.028
- Auburn #9B2226 ΔE 0.040
- Maroon #800000 ΔE 0.040
- Red Brown #8B2E16 ΔE 0.043
Use #900B10 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.