Hex #555d64 or rgb(85,93,100) in RGB space is the tint of blue. It has hue angle of 208.00 degrees, value = 39 and saturation = 15. #555d64 can be obtained by mixing 3 colors: 4 drops of magenta, 3 drops of blue, 5 drops of green.
Nearest safe hex - #666666. Below you can see the block with #555d64 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555d64 to the mixer and play with it.