@gav @hidden @druid @tamamizu Oolong is semi-oxidized, so kind of like "almost black tea", and is often processed in other ways (rolling, putting in a vacuum) to bring out different flavors.
I think red tea is what they call black tea in china, but what we call red tea is herbal tea from the rooibos plant, which grows in south africa.
There's also puerh, which is like fermented tea.
I saw some study saying that black tea has the highest levels of fluoride, but you'd have to drink a lot of it to exceed the healthy limit.