The hex color #6543a2 is a dark color. The web-safe version is Hex
#663399. A complementary color is
#9ABC5D. The grayscale version is
#6E6E6E. A 20% lighter version of the original color is
#9876D5, and Hex
#32106F is the 20% darker color. If the color is saturated by 10%, you get
#643FA7. If the color is desaturated by 10%, the color
#66479D is obtained.