Hex #002c39 or rgb(0,44,57) in RGB space is the tint of bluish cian. It has hue angle of 193.68 degrees, value = 22 and saturation = 100. #002c39 can be obtained by mixing 3 colors: 3 drops of blue, 1 drop of green, 5 drops of black.
Nearest safe hex - #003333. Below you can see the block with #002c39 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #002c39 to the mixer and play with it.