Hex #99a4aa or rgb(153,164,170) in RGB space is the tint of bluish cian. It has hue angle of 201.18 degrees, value = 67 and saturation = 10. #99a4aa can be obtained by mixing 4 colors: 4 drops of red, 5 drops of cyan, 5 drops of white, 1 drop of black.
Nearest safe hex - #999999. Below you can see the block with #99a4aa color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #99a4aa to the mixer and play with it.