The hex color #1B0599 is a dark color. The web-safe version is Hex
#330099. A complementary color is
#E4FA66. The grayscale version is
#3E3E3E. A 20% lighter version of the original color is
#4E38CC, and Hex
#000066 is the 20% darker color. If the color is saturated by 10%, you get
#1800A2. If the color is desaturated by 10%, the color
#1E0B90 is obtained.