I've never noticed any special difference, and I've never seen iced tea
get cloudy. I think any black tea will do, tho you might not want to
sqander expensive tea. Darjeeling nonsurprisingly makes weak iced tea,
and I haven't cared much for my experiments with green or white iced
tea. But I drank them. Sometimes I use one teabag of a tisane to
three teabags of black tea. Toci