Hex #66a055 or rgb(102,160,85) in RGB space is the tint of grass green. It has hue angle of 106.40 degrees, value = 63 and saturation = 47. #66a055 can be obtained by mixing 3 colors: 1 drop of magenta, 3 drops of green, 1 drop of white.
Nearest safe hex - #669966. Below you can see the block with #66a055 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #66a055 to the mixer and play with it.