Hex #99dddd or rgb(153,221,221) in RGB space is the tint of cyan. It has hue angle of 180.00 degrees, value = 87 and saturation = 31. #99dddd can be obtained by mixing 4 colors: 1 drop of yellow, 1 drop of magenta, 4 drops of cyan, 4 drops of white.
Nearest safe hex - #99cccc. Below you can see the block with #99dddd color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99dddd to the mixer and play with it.