The hex color #b10b15 is a dark color. The web-safe version is Hex
#990000. A complementary color is
#4EF4EA. The grayscale version is
#464646. A 20% lighter version of the original color is
#E43E48, and Hex
#7E0000 is the 20% darker color. If the color is saturated by 10%, you get
#BC0510. If the color is desaturated by 10%, the color
#A6111A is obtained.