The hex color #c72b10 is a dark color. The web-safe version is Hex
#CC3300. A complementary color is
#38D4EF. The grayscale version is
#565656. A 20% lighter version of the original color is
#FA5E43, and Hex
#940000 is the 20% darker color. If the color is saturated by 10%, you get
#D22709. If the color is desaturated by 10%, the color
#BC2F17 is obtained.