The hex color #b72f11 is a dark color. The web-safe version is Hex
#CC3300. A complementary color is
#48D0EE. The grayscale version is
#525252. A 20% lighter version of the original color is
#EA6244, and Hex
#840000 is the 20% darker color. If the color is saturated by 10%, you get
#C12B0A. If the color is desaturated by 10%, the color
#AD3318 is obtained.