The hex color #1a10c1 is a dark color. The web-safe version is Hex
#3300CC. A complementary color is
#E5EF3E. The grayscale version is
#4E4E4E. A 20% lighter version of the original color is
#4D43F4, and Hex
#00008E is the 20% darker color. If the color is saturated by 10%, you get
#150ACC. If the color is desaturated by 10%, the color
#1F16B6 is obtained.