The hex color #a10d0a is a dark color. The web-safe version is Hex
#990000. A complementary color is
#5EF2F5. The grayscale version is
#3D3D3D. A 20% lighter version of the original color is
#D4403D, and Hex
#6E0000 is the 20% darker color. If the color is saturated by 10%, you get
#AB0805. If the color is desaturated by 10%, the color
#97120F is obtained.