Well you are not much of an expert if you can't tell a Riesling from a Cote du Rhone. One would be a freshly tasting, dry (i.e. not sweet) German white wine and

Well you are not much of an expert if you can't tell a Riesling from a Cote du Rhone. One would be a freshly tasting, dry (i.e. not sweet) German white wine and the other a rather heavy red wine. I'm not an expert by any means but I've consumed plenty of both to be able to tell the difference by hangover alone. I guess there are a few grape varieties that are used for red and white wines that might pose some more tricky edge cases. E.g. pinot noir (a grape type) white wine is actually made with the same grapes as the red variety. The juice is actually color less; the skin has color. I guess it depends on how you process the grapes on what color wine you end up producing. And they'd obviously share a few of the same flavors because it is the same base ingredients that are used.