Hex #558f6c or rgb(85,143,108) in RGB space is the tint of teal. It has hue angle of 143.79 degrees, value = 56 and saturation = 41. #558f6c can be obtained by mixing 4 colors: 2 drops of blue, 4 drops of green, 5 drops of white, 4 drops of black.
Nearest safe hex - #669966. Below you can see the block with #558f6c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #558f6c to the mixer and play with it.