I’d recommend looking for the Swiss water processed decaf coffee. Also, on teas, I can drink decaf black teas (love English and Irish breakfast teas) without ill effect, thank goodness!
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Mine says “decaffeinated naturally” whatever that means!! Oh wait:
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I do end up having 5 cups though. 
whenever i buy decaf it is quite cheap and probably has extraction from the chemical technique. I’ll have to find the swiss water method!