The hex color #506b5c is a dark color. The web-safe version is Hex
#666666. A complementary color is
#AF94A3. The grayscale version is
#5D5D5D. A 20% lighter version of the original color is
#839E8F, and Hex
#1D3829 is the 20% darker color. If the color is saturated by 10%, you get
#4F6C5C. If the color is desaturated by 10%, the color
#516A5C is obtained.