The hex color #ac351c is a dark color. The web-safe version is Hex
#993333. A complementary color is
#53CAE3. The grayscale version is
#545454. A 20% lighter version of the original color is
#DF684F, and Hex
#790200 is the 20% darker color. If the color is saturated by 10%, you get
#B53216. If the color is desaturated by 10%, the color
#A33822 is obtained.