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I think it matters very much which process is used to decaffeinate the coffee.
http://en.wikipedia.org/wiki/Swiss_w..._water_process For example, the Swiss Water process (above) removes a lot more caffeine than methylene chloride or ethyl acetate, if I remember properly my cafe training. According to the Wiki page, you still get around 10mg of caffeine (about 10% of regular coffee's 100mg) in the average cup of decaf, but it varies wildly based on where you get it. I suspect a lot of the cafe-bought coffees (Starbucks, Dunkin's) have caffeine because they use one machine to process both regular and decaf coffee beans - hence, some caffeine is in the oils left from grinding the earlier beans. I don't know if that's enough to explain all of the caffeine, but certainly some of it. You're probably better off doing it at home (where contamination is not a risk, and you have more heavily regulated retail packagers providing you the bans). If you want true decaf, get tea. ![]() |
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