The hex color #509f4c is a dark color. The web-safe version is Hex
#669933. A complementary color is
#AF60B3. The grayscale version is
#696969. A 20% lighter version of the original color is
#83D27F, and Hex
#1D6C19 is the 20% darker color. If the color is saturated by 10%, you get
#4EA449. If the color is desaturated by 10%, the color
#539A4F is obtained.