Hex #558b4e or rgb(85,139,78) in RGB space is the tint of green. It has hue angle of 113.11 degrees, value = 55 and saturation = 44. #558b4e can be obtained by mixing 4 colors: 1 drop of magenta, 5 drops of green, 3 drops of white, 3 drops of black.
Nearest safe hex - #669966. Below you can see the block with #558b4e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #558b4e to the mixer and play with it.