Hex #12a58c or rgb(18,165,140) in RGB space is the tint of greenish cian. It has hue angle of 169.80 degrees, value = 65 and saturation = 89. #12a58c can be obtained by mixing 4 colors: 1 drop of magenta, 3 drops of blue, 5 drops of cyan, 5 drops of green.
Nearest safe hex - #009999. Below you can see the block with #12a58c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #12a58c to the mixer and play with it.