I thought this was going to be about how coffee is a consistent color so you can white balance your customers uploads by asking them to photograph coffee in their ambient lighting.
Coffee is definitely not consistent in color. You can absolutely tell the difference between a light and a dark roast, or a fresh and an hour old coffee.
I love the happy, optimistic outcome of running free association on the title. It reminds me of some of the really good questions I used to come up with as a child the first time I heard of a fact or concept.