Hex #127b5b or rgb(18,123,91) in RGB space is the tint of greenish cian. It has hue angle of 161.71 degrees, value = 48 and saturation = 85. #127b5b can be obtained by mixing 4 colors: 1 drop of red, 5 drops of cyan, 3 drops of green, 5 drops of black.
Nearest safe hex - #006666. Below you can see the block with #127b5b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #127b5b to the mixer and play with it.