The hex color #a6383c is a dark color. The web-safe version is Hex
#993333. A complementary color is
#59C7C3. The grayscale version is
#5E5E5E. A 20% lighter version of the original color is
#D96B6F, and Hex
#730509 is the 20% darker color. If the color is saturated by 10%, you get
#AD3439. If the color is desaturated by 10%, the color
#9F3C3F is obtained.