Hex #556468 or rgb(85,100,104) in RGB space is the tint of bluish cian. It has hue angle of 192.63 degrees, value = 41 and saturation = 18. #556468 can be obtained by mixing 4 colors: 2 drops of red, 4 drops of blue, 2 drops of green, 1 drop of white.
Nearest safe hex - #666666. Below you can see the block with #556468 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556468 to the mixer and play with it.