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Their suggestion violates at least one quasi-absolute rule many of us obey . They place tea bags in water and bring it to just short of a boil, steep for three minutes and remove.
Their observation is that Assam teas and water with high mineral content are a major cause of clouded iced tea. They use "store bought" tea bags.
Personally, I've never understood the caution about clouded iced tea. If it tastes good, it is good.
For those of who subscribe to the magazine, this item will be in the next issue.
Warren