The hex color #51891c is a dark color. The web-safe version is Hex
#669933. A complementary color is
#AE76E3. The grayscale version is
#525252. A 20% lighter version of the original color is
#84BC4F, and Hex
#1E5600 is the 20% darker color. If the color is saturated by 10%, you get
#518F17. If the color is desaturated by 10%, the color
#518421 is obtained.