Hex #708b8f or rgb(112,139,143) in RGB space is the tint of bluish cian. It has hue angle of 187.74 degrees, value = 56 and saturation = 22. #708b8f can be obtained by mixing 4 colors: 2 drops of red, 4 drops of cyan, 5 drops of white, 5 drops of black.
Nearest safe hex - #669999. Below you can see the block with #708b8f color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #708b8f to the mixer and play with it.