Hex #5b6168 or rgb(91,97,104) in RGB space is the tint of blue. It has hue angle of 212.31 degrees, value = 41 and saturation = 13. #5b6168 can be obtained by mixing 4 colors: 5 drops of red, 4 drops of blue, 3 drops of cyan, 2 drops of green.
Nearest safe hex - #666666. Below you can see the block with #5b6168 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b6168 to the mixer and play with it.