Hex #69999b or rgb(105,153,155) in RGB space is the tint of cyan. It has hue angle of 182.40 degrees, value = 61 and saturation = 32. #69999b can be obtained by mixing 4 colors: 5 drops of magenta, 5 drops of cyan, 5 drops of green, 2 drops of white.
Nearest safe hex - #669999. Below you can see the block with #69999b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #69999b to the mixer and play with it.