Hex #718a8e or rgb(113,138,142) in RGB space is the tint of bluish cian. It has hue angle of 188.28 degrees, value = 56 and saturation = 20. #718a8e can be obtained by mixing 4 colors: 1 drop of red, 2 drops of cyan, 3 drops of white, 3 drops of black.
Nearest safe hex - #669999. Below you can see the block with #718a8e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #718a8e to the mixer and play with it.