Hex #559f5d or rgb(85,159,93) in RGB space is the tint of green. It has hue angle of 126.49 degrees, value = 62 and saturation = 47. #559f5d can be obtained by mixing 4 colors: 4 drops of yellow, 5 drops of blue, 1 drop of cyan, 2 drops of green.
Nearest safe hex - #669966. Below you can see the block with #559f5d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #559f5d to the mixer and play with it.