Hex #667766 or rgb(102,119,102) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 47 and saturation = 14. #667766 can be obtained by mixing 4 colors: 1 drop of yellow, 3 drops of red, 4 drops of cyan, 2 drops of black.
Nearest safe hex - #666666. Below you can see the block with #667766 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667766 to the mixer and play with it.