The hex color #b61d2d is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#49E2D2. The grayscale version is
#555555. A 20% lighter version of the original color is
#E95060, and Hex
#830000 is the 20% darker color. If the color is saturated by 10%, you get
#C01729. If the color is desaturated by 10%, the color
#AC2331 is obtained.