Thoul wrote: We can only guess as to the identity of the green liquid inside the flasks.
Green liquid, indeed. This reminds me of "Star Trek". I don't remember any other tv show, movie, or any other thing using different colored liquids for drinks before they started doing it on the "Star Trek" tv shows. It is possible it may have happened before, but I just don't remember it. It was a thing of the future, I suppose.