Hex #306f5b or rgb(48,111,91) in RGB space is the tint of greenish cian. It has hue angle of 160.95 degrees, value = 44 and saturation = 57. #306f5b can be obtained by mixing 4 colors: 4 drops of blue, 4 drops of green, 3 drops of white, 5 drops of black.
Nearest safe hex - #336666. Below you can see the block with #306f5b color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #306f5b to the mixer and play with it.