The hex color #51308c is a dark color. The web-safe version is Hex
#663399. A complementary color is
#AECF73. The grayscale version is
#5A5A5A. A 20% lighter version of the original color is
#8463BF, and Hex
#1E0059 is the 20% darker color. If the color is saturated by 10%, you get
#502C91. If the color is desaturated by 10%, the color
#523487 is obtained.