Hex #0099a3 or rgb(0,153,163) in RGB space is the tint of cyan. It has hue angle of 183.68 degrees, value = 64 and saturation = 100. #0099a3 can be obtained by mixing 4 colors: 4 drops of blue, 5 drops of cyan, 2 drops of green, 1 drop of black.
Nearest safe hex - #009999. Below you can see the block with #0099a3 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #0099a3 to the mixer and play with it.