The hex color #a42c2c is a dark color. The web-safe version is Hex
#993333. A complementary color is
#5BD3D3. The grayscale version is
#545454. A 20% lighter version of the original color is
#D75F5F, and Hex
#710000 is the 20% darker color. If the color is saturated by 10%, you get
#AC2828. If the color is desaturated by 10%, the color
#9C3030 is obtained.