The hex color #c9c91f is a light color. The web-safe version is Hex
#CCCC33. A complementary color is
#3636E0. The grayscale version is
#909090. A 20% lighter version of the original color is
#FCFC52, and Hex
#969600 is the 20% darker color. If the color is saturated by 10%, you get
#CFCF14. If the color is desaturated by 10%, the color
#C3C32A is obtained.