Hex #005a6b or rgb(0,90,107) in RGB space is the tint of bluish cian. It has hue angle of 189.53 degrees, value = 42 and saturation = 100. #005a6b can be obtained by mixing 3 colors: 5 drops of blue, 2 drops of green, 1 drop of black.
Nearest safe hex - #006666. Below you can see the block with #005a6b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #005a6b to the mixer and play with it.