The hex color #a5090c is a dark color. The web-safe version is Hex
#990000. A complementary color is
#5AF6F3. The grayscale version is
#3E3E3E. A 20% lighter version of the original color is
#D83C3F, and Hex
#720000 is the 20% darker color. If the color is saturated by 10%, you get
#AF0407. If the color is desaturated by 10%, the color
#9B0E11 is obtained.