#666C5C

#666C5C

Color Values

HEX

#666C5C

RGB

102, 108, 92

HSL

82.5, 8.0%, 39.2%

HSV

82.5, 14.8%, 42.4%

CMYK

5.6%, 0.0%, 14.8%, 57.6%

OKLCH

0.5212 0.0255 124.0

Properties

Cool Dark Nearest: RAL 7023 Concrete Grey

Color Harmonies

Complementary

#666C5C

#625C6C

Analogous

#6C6A5C

#5E6C5C

#666C5C

Triadic

#666C5C

#5C666C

#6C5C66

Split Complementary

#666C5C

#5C5E6C

#6A5C6C

Tetradic

#666C5C

#5C6C6A

#625C6C

#6C5C5E

Color Blindness Simulation

Original

#666C5C

Protanopia

#696960

Deuteranopia

#686861

Tritanopia

#666364

Achromatopsia

#6A6A6A

CSS Usage

background-color: #666C5C;
color: #666C5C;
border-color: #666C5C;
Nearest Tailwind: Stone 500 #78716C

Tailwind Shades

50
#F7F8F7
100
#EDEEEC
200
#DCDED8
300
#C3C7BD
400
#A3A899
500
#828A75
600
#686E5E
700
#53584B
800
#41453B
900
#31342D
950
#1F211C

Contrast Checker

Text on white

5.43:1

AA Pass AAA Fail

Text on black

3.86:1

AA Fail AAA Fail

Related Articles

Brand Stories

Pantone Colors by Decade: The 2000s, 2010s, and 2020s Compared

Feb 01, 2026
Tutorials

Responsive Color: Adapting Colors for Different Screens

Jan 23, 2026
Tutorials

Color for Data Storytelling: Beyond Default Chart Colors

Jan 21, 2026