Hex #667f60 or rgb(102,127,96) in RGB space is the tint of grass green. It has hue angle of 108.39 degrees, value = 50 and saturation = 24. #667f60 can be obtained by mixing 4 colors: 5 drops of red, 1 drop of magenta, 5 drops of cyan, 4 drops of green.
Nearest safe hex - #666666. Below you can see the block with #667f60 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667f60 to the mixer and play with it.