The hex color #ac110c is a dark color. The web-safe version is Hex
#990000. A complementary color is
#53EEF3. The grayscale version is
#434343. A 20% lighter version of the original color is
#DF443F, and Hex
#790000 is the 20% darker color. If the color is saturated by 10%, you get
#B70C07. If the color is desaturated by 10%, the color
#A21612 is obtained.