Hex #556e8e or rgb(85,110,142) in RGB space is the tint of blue. It has hue angle of 213.68 degrees, value = 56 and saturation = 40. #556e8e can be obtained by mixing 4 colors: 5 drops of magenta, 3 drops of blue, 3 drops of cyan, 4 drops of green.
Nearest safe hex - #666699. Below you can see the block with #556e8e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556e8e to the mixer and play with it.