Hex #556279 or rgb(85,98,121) in RGB space is the tint of blue violet. It has hue angle of 218.33 degrees, value = 47 and saturation = 30. #556279 can be obtained by mixing 4 colors: 4 drops of magenta, 3 drops of blue, 1 drop of cyan, 4 drops of green.
Nearest safe hex - #666666. Below you can see the block with #556279 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #556279 to the mixer and play with it.