Hex #556379 or rgb(85,99,121) in RGB space is the tint of blue. It has hue angle of 216.67 degrees, value = 47 and saturation = 30. #556379 can be obtained by mixing 4 colors: 3 drops of red, 1 drop of magenta, 5 drops of cyan, 3 drops of black.
Nearest safe hex - #666666. Below you can see the block with #556379 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556379 to the mixer and play with it.