Hex #556467 or rgb(85,100,103) in RGB space is the tint of bluish cian. It has hue angle of 190.00 degrees, value = 40 and saturation = 17. #556467 can be obtained by mixing 4 colors: 1 drop of yellow, 4 drops of magenta, 5 drops of blue, 5 drops of green.
Nearest safe hex - #666666. Below you can see the block with #556467 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556467 to the mixer and play with it.