Hex #667561 or rgb(102,117,97) in RGB space is the tint of grass green. It has hue angle of 105.00 degrees, value = 46 and saturation = 17. #667561 can be obtained by mixing 4 colors: 3 drops of yellow, 4 drops of blue, 3 drops of white, 5 drops of black.
Nearest safe hex - #666666. Below you can see the block with #667561 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #667561 to the mixer and play with it.