Hex #555f78 or rgb(85,95,120) in RGB space is the tint of blue violet. It has hue angle of 222.86 degrees, value = 47 and saturation = 29. #555f78 can be obtained by mixing 4 colors: 5 drops of magenta, 4 drops of blue, 1 drop of cyan, 5 drops of green.
Nearest safe hex - #666666. Below you can see the block with #555f78 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555f78 to the mixer and play with it.