Hex #557f68 or rgb(85,127,104) in RGB space is the tint of teal. It has hue angle of 147.14 degrees, value = 50 and saturation = 33. #557f68 can be obtained by mixing 4 colors: 3 drops of red, 1 drop of blue, 3 drops of cyan, 2 drops of green.
Nearest safe hex - #666666. Below you can see the block with #557f68 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #557f68 to the mixer and play with it.