The hex color #550b6c is a dark color. The web-safe version is Hex
#660066. A complementary color is
#AAF493. The grayscale version is
#444444. A 20% lighter version of the original color is
#883E9F, and Hex
#220039 is the 20% darker color. If the color is saturated by 10%, you get
#570570. If the color is desaturated by 10%, the color
#531168 is obtained.