Hex #559b80 or rgb(85,155,128) in RGB space is the tint of teal. It has hue angle of 156.86 degrees, value = 61 and saturation = 45. #559b80 can be obtained by mixing 4 colors: 1 drop of cyan, 1 drop of green, 2 drops of white, 2 drops of black.
Nearest safe hex - #669999. Below you can see the block with #559b80 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #559b80 to the mixer and play with it.