The hex color #516b51 is a dark color. The web-safe version is Hex
#666666. A complementary color is
#AE94AE. The grayscale version is
#5A5A5A. A 20% lighter version of the original color is
#849E84, and Hex
#1E381E is the 20% darker color. If the color is saturated by 10%, you get
#506D50. If the color is desaturated by 10%, the color
#526952 is obtained.