The hex color #18311c is a dark color. The web-safe version is Hex
#003333. A complementary color is
#E7CEE3. The grayscale version is
#222222. A 20% lighter version of the original color is
#4B644F, and Hex
#000000 is the 20% darker color. If the color is saturated by 10%, you get
#17331B. If the color is desaturated by 10%, the color
#192F1D is obtained.