Hex #509f50 or rgb(80,159,80) in RGB space is the tint of green. It has hue angle of 120.00 degrees, value = 62 and saturation = 50. #509f50 can be obtained by mixing 4 colors: 5 drops of yellow, 5 drops of cyan, 1 drop of green, 5 drops of black.
Nearest safe hex - #669966. Below you can see the block with #509f50 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #509f50 to the mixer and play with it.