The hex color #75173f is a dark color. The web-safe version is Hex
#660033. A complementary color is
#8AE8C0. The grayscale version is
#444444. A 20% lighter version of the original color is
#A84A72, and Hex
#42000C is the 20% darker color. If the color is saturated by 10%, you get
#7A133F. If the color is desaturated by 10%, the color
#701B3F is obtained.