Hex #5590a3 or rgb(85,144,163) in RGB space is the tint of bluish cian. It has hue angle of 194.62 degrees, value = 64 and saturation = 48. #5590a3 can be obtained by mixing 3 colors: 4 drops of magenta, 5 drops of cyan, 3 drops of green.
Nearest safe hex - #669999. Below you can see the block with #5590a3 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #5590a3 to the mixer and play with it.