The hex color #72131c is a dark color. The web-safe version is Hex
#660033. A complementary color is
#8DECE3. The grayscale version is
#363636. A 20% lighter version of the original color is
#A5464F, and Hex
#3F0000 is the 20% darker color. If the color is saturated by 10%, you get
#781019. If the color is desaturated by 10%, the color
#6C161F is obtained.