#631B13

#631B13

Color Values

HEX

#631B13

RGB

99, 27, 19

HSL

6.0, 67.8%, 23.1%

HSV

6.0, 80.8%, 38.8%

CMYK

0.0%, 72.7%, 80.8%, 61.2%

OKLCH

0.3388 0.1052 29.8

Properties

Warm Dark Nearest: RAL 3011 Brown Red

Color Harmonies

Complementary

#631B13

#135B63

Analogous

#631333

#634313

#631B13

Triadic

#631B13

#13631B

#1B1363

Split Complementary

#631B13

#136343

#133363

Tetradic

#631B13

#336313

#135B63

#431363

Color Blindness Simulation

Original

#631B13

Protanopia

#444315

Deuteranopia

#484D15

Tritanopia

#5F1617

Achromatopsia

#2A2A2A

CSS Usage

background-color: #631B13;
color: #631B13;
border-color: #631B13;
Nearest Tailwind: Red 900 #7F1D1D

Tailwind Shades

50
#FCF4F3
100
#F7E5E3
200
#F4C8C3
300
#EBA198
400
#E16D61
500
#D63A29
600
#AB2F21
700
#89251A
800
#6B1D15
900
#4E1913
950
#31100C

Contrast Checker

Text on white

12.38:1

AA Pass AAA Pass

Text on black

1.7:1

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