#640A0B

#640A0B

Color Values

HEX

#640A0B

RGB

100, 10, 11

HSL

359.3, 81.8%, 21.6%

HSV

359.3, 90.0%, 39.2%

CMYK

0.0%, 90.0%, 89.0%, 60.8%

OKLCH

0.3237 0.1219 27.1

Properties

Warm Dark Nearest: RAL 3011 Brown Red

Color Harmonies

Complementary

#640A0B

#0A6463

Analogous

#640A38

#64360A

#640A0B

Triadic

#640A0B

#0B640A

#0A0B64

Split Complementary

#640A0B

#0A6436

#0A3864

Tetradic

#640A0B

#38640A

#0A6463

#360A64

Color Blindness Simulation

Original

#640A0B

Protanopia

#3D3C0B

Deuteranopia

#42490B

Tritanopia

#600B0B

Achromatopsia

#1D1D1D

CSS Usage

background-color: #640A0B;
color: #640A0B;
border-color: #640A0B;
Nearest Tailwind: Red 900 #7F1D1D

Tailwind Shades

50
#FDF2F2
100
#FAE1E1
200
#F9BEBF
300
#F49091
400
#EE5355
500
#E8171A
600
#B91315
700
#940F10
800
#740C0D
900
#540D0E
950
#350809

Contrast Checker

Text on white

13.21:1

AA Pass AAA Pass

Text on black

1.59:1

AA Fail AAA Fail

Related Articles

Tutorials

CSS color-mix(): Blend Colors Natively in the Browser

Jan 26, 2026
Tutorials

Building a Color Picker Web Component from Scratch

Jan 21, 2026
Tutorials

Perceptual Color Spaces: Lab, LCH, Oklab, OKLCH

Jan 15, 2026