Hex #556d5f or rgb(85,109,95) in RGB space is the tint of teal. It has hue angle of 145.00 degrees, value = 43 and saturation = 22. #556d5f can be obtained by mixing 4 colors: 3 drops of red, 2 drops of blue, 2 drops of cyan, 2 drops of green.
Nearest safe hex - #666666. Below you can see the block with #556d5f color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556d5f to the mixer and play with it.