The hex color #a0020f is a dark color. The web-safe version is Hex
#990000. A complementary color is
#5FFDF0. The grayscale version is
#3B3B3B. A 20% lighter version of the original color is
#D33542, and Hex
#6D0000 is the 20% darker color. If the color is saturated by 10%, you get
#AA000B. If the color is desaturated by 10%, the color
#960813 is obtained.