The hex color #b5221c is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#4ADDE3. The grayscale version is
#515151. A 20% lighter version of the original color is
#E8554F, and Hex
#820000 is the 20% darker color. If the color is saturated by 10%, you get
#BF1D17. If the color is desaturated by 10%, the color
#AB2721 is obtained.