The hex color #721e1c is a dark color. The web-safe version is Hex
#663333. A complementary color is
#8DE1E3. The grayscale version is
#393939. A 20% lighter version of the original color is
#A5514F, and Hex
#3F0000 is the 20% darker color. If the color is saturated by 10%, you get
#781B19. If the color is desaturated by 10%, the color
#6C211F is obtained.