Hex #99dee6 or rgb(153,222,230) in RGB space is the tint of cyan. It has hue angle of 186.23 degrees, value = 90 and saturation = 33. #99dee6 can be obtained by mixing 3 colors: 1 drop of red, 4 drops of cyan, 5 drops of white.
Nearest safe hex - #99ccff. Below you can see the block with #99dee6 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99dee6 to the mixer and play with it.