The hex color #671b2c is a dark color. The web-safe version is Hex
#663333. A complementary color is
#98E4D3. The grayscale version is
#3A3A3A. A 20% lighter version of the original color is
#9A4E5F, and Hex
#340000 is the 20% darker color. If the color is saturated by 10%, you get
#6C182B. If the color is desaturated by 10%, the color
#631E2D is obtained.