The hex color #b52e2c is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#4AD1D3. The grayscale version is
#5A5A5A. A 20% lighter version of the original color is
#E8615F, and Hex
#820000 is the 20% darker color. If the color is saturated by 10%, you get
#BE2A27. If the color is desaturated by 10%, the color
#AC3231 is obtained.