Hex #555b8e or rgb(85,91,142) in RGB space is the tint of violet. It has hue angle of 233.68 degrees, value = 56 and saturation = 40. #555b8e can be obtained by mixing 4 colors: 5 drops of magenta, 5 drops of cyan, 1 drop of green, 4 drops of black.
Nearest safe hex - #666699. Below you can see the block with #555b8e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #555b8e to the mixer and play with it.