Hex #5b6d6e or rgb(91,109,110) in RGB space is the tint of cyan. It has hue angle of 183.16 degrees, value = 43 and saturation = 17. #5b6d6e can be obtained by mixing 4 colors: 5 drops of red, 3 drops of blue, 4 drops of cyan, 2 drops of green.
Nearest safe hex - #666666. Below you can see the block with #5b6d6e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b6d6e to the mixer and play with it.