Hex #005156 or rgb(0,81,86) in RGB space is the tint of cyan. It has hue angle of 183.49 degrees, value = 34 and saturation = 100. #005156 can be obtained by mixing 3 colors: 2 drops of blue, 1 drop of green, 1 drop of black.
Nearest safe hex - #006666. Below you can see the block with #005156 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #005156 to the mixer and play with it.