Hex #005b72 or rgb(0,91,114) in RGB space is the tint of bluish cian. It has hue angle of 192.11 degrees, value = 45 and saturation = 100. #005b72 can be obtained by mixing 3 colors: 1 drop of blue, 2 drops of cyan, 3 drops of black.
Nearest safe hex - #006666. Below you can see the block with #005b72 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #005b72 to the mixer and play with it.