Hex #309c80 or rgb(48,156,128) in RGB space is the tint of greenish cian. It has hue angle of 164.44 degrees, value = 61 and saturation = 69. #309c80 can be obtained by mixing 4 colors: 5 drops of cyan, 3 drops of green, 3 drops of white, 5 drops of black.
Nearest safe hex - #339999. Below you can see the block with #309c80 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #309c80 to the mixer and play with it.