The hex color #a9152e is a dark color. The web-safe version is Hex
#990033. A complementary color is
#56EAD1. The grayscale version is
#4F4F4F. A 20% lighter version of the original color is
#DC4861, and Hex
#760000 is the 20% darker color. If the color is saturated by 10%, you get
#B20F2B. If the color is desaturated by 10%, the color
#A01B31 is obtained.