Hex #668560 or rgb(102,133,96) in RGB space is the tint of grass green. It has hue angle of 110.27 degrees, value = 52 and saturation = 28. #668560 can be obtained by mixing 4 colors: 1 drop of magenta, 4 drops of green, 5 drops of white, 5 drops of black.
Nearest safe hex - #669966. Below you can see the block with #668560 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #668560 to the mixer and play with it.