Hex #5b676d or rgb(91,103,109) in RGB space is the tint of bluish cian. It has hue angle of 200.00 degrees, value = 43 and saturation = 17. #5b676d can be obtained by mixing 4 colors: 4 drops of red, 5 drops of cyan, 1 drop of white, 4 drops of black.
Nearest safe hex - #666666. Below you can see the block with #5b676d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b676d to the mixer and play with it.