The hex color #a91e30 is a dark color. The web-safe version is Hex
#993333. A complementary color is
#56E1CF. The grayscale version is
#525252. A 20% lighter version of the original color is
#DC5163, and Hex
#760000 is the 20% darker color. If the color is saturated by 10%, you get
#B2192D. If the color is desaturated by 10%, the color
#A02333 is obtained.