The hex color #a30b0e is a dark color. The web-safe version is Hex
#990000. A complementary color is
#5CF4F1. The grayscale version is
#3F3F3F. A 20% lighter version of the original color is
#D63E41, and Hex
#700000 is the 20% darker color. If the color is saturated by 10%, you get
#AD0609. If the color is desaturated by 10%, the color
#991013 is obtained.