Hex #15c09c or rgb(21,192,156) in RGB space is the tint of greenish cian. It has hue angle of 167.37 degrees, value = 75 and saturation = 89. #15c09c can be obtained by mixing 4 colors: 2 drops of blue, 5 drops of cyan, 4 drops of green, 1 drop of white.
Nearest safe hex - #00cc99. Below you can see the block with #15c09c color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #15c09c to the mixer and play with it.