US. When I go to my local grocery store, they’re categorized under white or red.

At least for white, that is indeed how the English Wikipedia classifies different grape cultivars, even ones that aren’t intended to make wine. Black is new to me though.

https://en.wikipedia.org/wiki/Sultana_(grape)

https://en.wikipedia.org/wiki/Almeria_(grape)

https://en.wikipedia.org/wiki/Italia_(grape)

Might just be that my grocery store is real local and they do it differently. I try to avoid large chains. But I’ve always understood white and red to be the technical classifiers of grapes, and the actual color you see with your eyes varies.

I’m also from a wine-producing region, so maybe that has something to do with it as well.

Might be different in other languages, but English usually divides grapes into red and white for color.

Or purple grapes red?

(I’m guessing due to the type of wine they make)

So what happened 5 years ago?