Hex #128c5b or rgb(18,140,91) in RGB space is the tint of teal. It has hue angle of 155.90 degrees, value = 55 and saturation = 87. #128c5b can be obtained by mixing 4 colors: 1 drop of yellow, 5 drops of cyan, 3 drops of green, 5 drops of black.
Nearest safe hex - #009966. Below you can see the block with #128c5b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #128c5b to the mixer and play with it.