The hex color #b551a0 is a dark color. The web-safe version is Hex
#CC6699. A complementary color is
#4AAE5F. The grayscale version is
#8D8D8D. A 20% lighter version of the original color is
#E884D3, and Hex
#821E6D is the 20% darker color. If the color is saturated by 10%, you get
#B94BA2. If the color is desaturated by 10%, the color
#B1579E is obtained.