The hex color #516b58 is a dark color. The web-safe version is Hex
#666666. A complementary color is
#AE94A7. The grayscale version is
#5C5C5C. A 20% lighter version of the original color is
#849E8B, and Hex
#1E3825 is the 20% darker color. If the color is saturated by 10%, you get
#506D58. If the color is desaturated by 10%, the color
#526A58 is obtained.