The hex color #291d28 is a dark color. The web-safe version is Hex
#333333. A complementary color is
#D6E2D7. The grayscale version is
#252525. A 20% lighter version of the original color is
#5C505B, and Hex
#000000 is the 20% darker color. If the color is saturated by 10%, you get
#291C28. If the color is desaturated by 10%, the color
#291E28 is obtained.