The hex color #d4250c is a dark color. The web-safe version is Hex
#CC3300. A complementary color is
#2BDAF3. The grayscale version is
#575757. A 20% lighter version of the original color is
#FF583F, and Hex
#A10000 is the 20% darker color. If the color is saturated by 10%, you get
#E12005. If the color is desaturated by 10%, the color
#C82A14 is obtained.