Hex #558d72 or rgb(85,141,114) in RGB space is the tint of teal. It has hue angle of 151.07 degrees, value = 55 and saturation = 40. #558d72 can be obtained by mixing 4 colors: 1 drop of red, 3 drops of blue, 3 drops of green, 2 drops of white.
Nearest safe hex - #669966. Below you can see the block with #558d72 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #558d72 to the mixer and play with it.