Hex #5b666e or rgb(91,102,110) in RGB space is the tint of blue. It has hue angle of 205.26 degrees, value = 43 and saturation = 17. #5b666e can be obtained by mixing 4 colors: 2 drops of yellow, 3 drops of magenta, 4 drops of cyan, 5 drops of black.
Nearest safe hex - #666666. Below you can see the block with #5b666e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b666e to the mixer and play with it.