Hex #005a55 or rgb(0,90,85) in RGB space is the tint of cyan. It has hue angle of 176.67 degrees, value = 35 and saturation = 100. #005a55 can be obtained by mixing 4 colors: 3 drops of blue, 1 drop of cyan, 2 drops of green, 3 drops of black.
Nearest safe hex - #006666. Below you can see the block with #005a55 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #005a55 to the mixer and play with it.