The hex color #661f6c is a dark color. The web-safe version is Hex
#663366. A complementary color is
#99E093. The grayscale version is
#505050. A 20% lighter version of the original color is
#99529F, and Hex
#330039 is the 20% darker color. If the color is saturated by 10%, you get
#681A6F. If the color is desaturated by 10%, the color
#642469 is obtained.