The hex color #687c1b is a dark color. The web-safe version is Hex
#666633. A complementary color is
#9783E4. The grayscale version is
#555555. A 20% lighter version of the original color is
#9BAF4E, and Hex
#354900 is the 20% darker color. If the color is saturated by 10%, you get
#6A8015. If the color is desaturated by 10%, the color
#667821 is obtained.