Hex #12553d or rgb(18,85,61) in RGB space is the tint of greenish cian. It has hue angle of 158.51 degrees, value = 33 and saturation = 79. #12553d can be obtained by mixing 4 colors: 1 drop of magenta, 4 drops of blue, 5 drops of green, 4 drops of black.
Nearest safe hex - #006633. Below you can see the block with #12553d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #12553d to the mixer and play with it.