Hex #559f66 or rgb(85,159,102) in RGB space is the tint of bluish green. It has hue angle of 133.78 degrees, value = 62 and saturation = 47. #559f66 can be obtained by mixing 4 colors: 4 drops of yellow, 5 drops of cyan, 1 drop of white, 5 drops of black.
Nearest safe hex - #669966. Below you can see the block with #559f66 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #559f66 to the mixer and play with it.