The hex color #c73f1d is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#38C0E2. The grayscale version is
#616161. A 20% lighter version of the original color is
#FA7250, and Hex
#940C00 is the 20% darker color. If the color is saturated by 10%, you get
#D13C16. If the color is desaturated by 10%, the color
#BD4224 is obtained.