The hex color #b4010f is a dark color. The web-safe version is Hex
#CC0000. A complementary color is
#4BFEF0. The grayscale version is
#414141. A 20% lighter version of the original color is
#E73442, and Hex
#810000 is the 20% darker color. If the color is saturated by 10%, you get
#BF000A. If the color is desaturated by 10%, the color
#A90714 is obtained.