Hex #004f55 or rgb(0,79,85) in RGB space is the tint of cyan. It has hue angle of 184.24 degrees, value = 33 and saturation = 100. #004f55 can be obtained by mixing 2 colors: 1 drop of cyan, 2 drops of black.
Nearest safe hex - #006666. Below you can see the block with #004f55 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #004f55 to the mixer and play with it.