Hex #718c8e or rgb(113,140,142) in RGB space is the tint of cyan. It has hue angle of 184.14 degrees, value = 56 and saturation = 20. #718c8e can be obtained by mixing 3 colors: 1 drop of cyan, 4 drops of white, 4 drops of black.
Nearest safe hex - #669999. Below you can see the block with #718c8e color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #718c8e to the mixer and play with it.