#B66538
Closest named color: Copper (#B66325). oklch(59.1% 0.12 48.1), rgb(182, 101, 56).
Aa
Black text reads best on this color (4.90:1).
About this color
#B66538 is a medium-dark, moderately saturated brown. In OKLCH its lightness is 59%, its chroma 0.120 and its hue 48°. Its hue sits on the warm side of the wheel. The nearest named color is Copper (#B66325), ΔE 0.015 away. Black text reads best on it, at 4.90:1.
| Hue family | Browns |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.120) |
| Temperature | warm |
| Nearest name | Copper (#B66325) |
| Black text | 4.90:1 |
| White text | 4.27:1 |
Values
| HEX | #B66538 |
| RGB | rgb(182, 101, 56) |
| HSL | hsl(21, 53%, 47%) |
| OKLCH | oklch(59.1% 0.12 48.1) |
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 #B66538 | 4.27:1 | AA large text | Lc -74.7 | Content text, not long reading |
| Black text on #B66538 | 4.90:1 | AA | Lc 34.9 | Non-text elements, placeholder text |
| #B66538 text on white | 4.27:1 | AA large text | Lc 69.2 | Content text, not long reading |
| #B66538 text on black | 4.90:1 | AA | Lc -32.4 | Non-text elements, placeholder text |
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
#FAF4F1
oklch(97.1% 0.008 48.7)
-
Step 100
100
#F3E7E1
oklch(93.6% 0.015 48.6)
-
Step 200
200
#EBD4C8
oklch(88.6% 0.03 49.4)
-
Step 300
300
#DFB7A3
oklch(81% 0.054 48)
-
Step 400
400
#CD9071
oklch(70.6% 0.086 47.8)
-
Step 500
500
#BF744B
oklch(63.2% 0.11 48.6)
-
Step 600
600 (this color)
#B66538
oklch(59.1% 0.12 48.1)
-
Step 700
700
#924A20
oklch(49.1% 0.111 48)
-
Step 800
800
#773D1C
oklch(42.7% 0.093 48)
-
Step 900
900
#60351D
oklch(37.8% 0.072 48.6)
-
Step 950
950
#381F12
oklch(26.9% 0.045 47.6)
#B66538 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) | #7C6F33 | 0.104 |
| Deuteranopia (no green cones) | #8F8137 | 0.095 |
| Tritanopia (no blue cones) | #C7555B | 0.071 |
| Achromatopsia (no color) | #7A7A7A | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B66538
#B66538
oklch(59.1% 0.12 48.1)
- #008AB3
#008AB3
oklch(59.1% 0.115 227.8)
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 #B66538, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Copper #B66325 ΔE 0.015
- Adobe #BD6C48 ΔE 0.025
- Clay #B66A50 ΔE 0.026
- Clay Brown #B2713D ΔE 0.028
- Tiger's Eye #BC6C25 ΔE 0.029
- Orange Brown #BE6400 ΔE 0.032
- Orangey Brown #B16002 ΔE 0.034
- Umber #B26400 ΔE 0.034
Use #B66538 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.