Hex #005a6f or rgb(0,90,111) in RGB space is the tint of bluish cian. It has hue angle of 191.35 degrees, value = 44 and saturation = 100. #005a6f can be obtained by mixing 4 colors: 4 drops of blue, 3 drops of cyan, 1 drop of green, 5 drops of black.
Nearest safe hex - #006666. Below you can see the block with #005a6f color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #005a6f to the mixer and play with it.