Hex #5b6f8c or rgb(91,111,140) in RGB space is the tint of blue. It has hue angle of 215.51 degrees, value = 55 and saturation = 35. #5b6f8c can be obtained by mixing 3 colors: 4 drops of blue, 5 drops of white, 5 drops of black.
Nearest safe hex - #666699. Below you can see the block with #5b6f8c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b6f8c to the mixer and play with it.