Hex #12403d or rgb(18,64,61) in RGB space is the tint of cyan. It has hue angle of 176.09 degrees, value = 25 and saturation = 72. #12403d can be obtained by mixing 4 colors: 1 drop of red, 5 drops of blue, 3 drops of green, 5 drops of black.
Nearest safe hex - #003333. Below you can see the block with #12403d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #12403d to the mixer and play with it.