Hex #555c72 or rgb(85,92,114) in RGB space is the tint of blue violet. It has hue angle of 225.52 degrees, value = 45 and saturation = 25. #555c72 can be obtained by mixing 4 colors: 2 drops of yellow, 1 drop of magenta, 5 drops of blue, 1 drop of black.
Nearest safe hex - #666666. Below you can see the block with #555c72 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555c72 to the mixer and play with it.