What are the chances; as I drink this, I am writing an anniversary card to my wife with a BIC pen, on the day the ballpoint pen came to be! Alas, it has been months that one has been able to purchase Green Chartreuse in Canada so I have used Yellow. I am surprised that unless I missed it, while there are Last Word variants that use Yellow Chartreuse, none use gin as the base spirit. So with the assistance of a Google search and AI, "I" can report that using Yellow in place of Green results in a "sweeter and less herbaceous, more citrusy finish" with less total ABV. Still, a very good drink.