Hex #558e72 or rgb(85,142,114) in RGB space is the tint of teal. It has hue angle of 150.53 degrees, value = 56 and saturation = 40. #558e72 can be obtained by mixing 4 colors: 2 drops of blue, 3 drops of green, 4 drops of white, 3 drops of black.
Nearest safe hex - #669966. Below you can see the block with #558e72 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #558e72 to the mixer and play with it.