The hex color #b42c20 is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#4BD3DF. The grayscale version is
#555555. A 20% lighter version of the original color is
#E75F53, and Hex
#810000 is the 20% darker color. If the color is saturated by 10%, you get
#BD281B. If the color is desaturated by 10%, the color
#AB3025 is obtained.