The hex color #b3300c is a dark color. The web-safe version is Hex
#CC3300. A complementary color is
#4CCFF3. The grayscale version is
#505050. A 20% lighter version of the original color is
#E6633F, and Hex
#800000 is the 20% darker color. If the color is saturated by 10%, you get
#BD2D05. If the color is desaturated by 10%, the color
#A93313 is obtained.