Hex #557d6c or rgb(85,125,108) in RGB space is the tint of teal. It has hue angle of 154.50 degrees, value = 49 and saturation = 32. #557d6c can be obtained by mixing 4 colors: 5 drops of red, 2 drops of blue, 5 drops of cyan, 3 drops of green.
Nearest safe hex - #666666. Below you can see the block with #557d6c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557d6c to the mixer and play with it.