Hex #556a7d or rgb(85,106,125) in RGB space is the tint of blue. It has hue angle of 208.50 degrees, value = 49 and saturation = 32. #556a7d can be obtained by mixing 4 colors: 5 drops of magenta, 3 drops of blue, 2 drops of cyan, 5 drops of green.
Nearest safe hex - #666666. Below you can see the block with #556a7d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556a7d to the mixer and play with it.