Hex #60999f or rgb(96,153,159) in RGB space is the tint of cyan. It has hue angle of 185.71 degrees, value = 62 and saturation = 40. #60999f can be obtained by mixing 4 colors: 1 drop of red, 3 drops of cyan, 2 drops of white, 2 drops of black.
Nearest safe hex - #669999. Below you can see the block with #60999f color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #60999f to the mixer and play with it.