The hex color #a42c29 is a dark color. The web-safe version is Hex
#993333. A complementary color is
#5BD3D6. The grayscale version is
#535353. A 20% lighter version of the original color is
#D75F5C, and Hex
#710000 is the 20% darker color. If the color is saturated by 10%, you get
#AC2825. If the color is desaturated by 10%, the color
#9C302D is obtained.