Hex #509935 or rgb(80,153,53) in RGB space is the tint of grass green. It has hue angle of 103.80 degrees, value = 60 and saturation = 65. #509935 can be obtained by mixing 4 colors: 5 drops of yellow, 5 drops of blue, 5 drops of green, 1 drop of black.
Nearest safe hex - #669933. Below you can see the block with #509935 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #509935 to the mixer and play with it.