The hex color #6b4dba is a dark color. The web-safe version is Hex
#6666CC. A complementary color is
#94B245. The grayscale version is
#7B7B7B. A 20% lighter version of the original color is
#9E80ED, and Hex
#381A87 is the 20% darker color. If the color is saturated by 10%, you get
#6948C0. If the color is desaturated by 10%, the color
#6D52B4 is obtained.