For all its secrets, fans do know a few specifics about the production of Chartreuse, like the source of the color. Green Chartreuse is colored by vegetal chlorophyll, and yellow Chartreuse is ...

It’s also one of a handful of spirits that age and mature after bottling. Yellow chartreuse is almost pale ochre in color as it sees less time steeping, whereas green chartreuse is deep emerald green.

Its yellow color comes from saffron, and at 86 proof, or 43% ABV, Yellow Chartreuse is softer and slightly sweeter than its Green counterpart.