The hex color #596C66 is a dark color. The web-safe version is Hex
#666666. A complementary color is
#A69399. The grayscale version is
#646464. A 20% lighter version of the original color is
#8C9F99, and Hex
#263933 is the 20% darker color. If the color is saturated by 10%, you get
#586D66. If the color is desaturated by 10%, the color
#5A6B66 is obtained.