Hex #5b888c or rgb(91,136,140) in RGB space is the tint of cyan. It has hue angle of 184.90 degrees, value = 55 and saturation = 35. #5b888c can be obtained by mixing 4 colors: 1 drop of red, 4 drops of magenta, 5 drops of cyan, 4 drops of green.
Nearest safe hex - #669999. Below you can see the block with #5b888c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b888c to the mixer and play with it.