Hex #003f4d or rgb(0,63,77) in RGB space is the tint of bluish cian. It has hue angle of 190.91 degrees, value = 30 and saturation = 100. #003f4d can be obtained by mixing 4 colors: 3 drops of blue, 1 drop of cyan, 1 drop of green, 5 drops of black.
Nearest safe hex - #003366. Below you can see the block with #003f4d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #003f4d to the mixer and play with it.