The hex color #a81a19 is a dark color. The web-safe version is Hex
#993300. A complementary color is
#57E5E6. The grayscale version is
#494949. A 20% lighter version of the original color is
#DB4D4C, and Hex
#750000 is the 20% darker color. If the color is saturated by 10%, you get
#B21514. If the color is desaturated by 10%, the color
#9F1F1E is obtained.