Hex #559d68 or rgb(85,157,104) in RGB space is the tint of bluish green. It has hue angle of 135.83 degrees, value = 62 and saturation = 46. #559d68 can be obtained by mixing 4 colors: 3 drops of yellow, 4 drops of blue, 1 drop of cyan, 1 drop of green.
Nearest safe hex - #669966. Below you can see the block with #559d68 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #559d68 to the mixer and play with it.