Hex #99afb3 or rgb(153,175,179) in RGB space is the tint of bluish cian. It has hue angle of 189.23 degrees, value = 70 and saturation = 15. #99afb3 can be obtained by mixing 4 colors: 1 drop of red, 2 drops of cyan, 5 drops of white, 2 drops of black.
Nearest safe hex - #9999cc. Below you can see the block with #99afb3 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99afb3 to the mixer and play with it.