Crimson
#B31D09 · Crimson
#B31D09 is Crimson, a warm red color. It has an RGB value of 179, 29, 9 and a relative luminance of 0.105, making it a dark surface.
Temperature
☀ Warm
Hue family
red
Luminance
0.10
Conversions
HEX
RGB
HSL
HSV
CMYK
OKLCHPro
Contrast & accessibility
On white
The quick fox
6.78:1
AA normal✓
AA large✓
AAA normal✕
On black
The quick fox
3.10:1
AA normal✕
AA large✓
AAA normal✕
Color harmonies
Complementary
Split-complementary
Shades & tints
Similar named colors
Frequently asked
What is the color #B31D09?
#B31D09 is Crimson, a warm red color. In RGB it is 179, 29, 9, and in HSL it is 7°, 90%, 37%.
Is #B31D09 a light or dark color?
#B31D09 has a relative luminance of 0.105, so it reads as a dark surface. Use light text on top of it for the best contrast.
What colors go well with #B31D09?
Its complementary color is #099FB3. For softer combinations, try the analogous or split-complementary harmonies shown above.