Hex #5b998c or rgb(91,153,140) in RGB space is the tint of greenish cian. It has hue angle of 167.42 degrees, value = 60 and saturation = 41. #5b998c can be obtained by mixing 4 colors: 1 drop of yellow, 4 drops of magenta, 5 drops of cyan, 4 drops of green.
Nearest safe hex - #669999. Below you can see the block with #5b998c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5b998c to the mixer and play with it.