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How do you decaffeinated coffee?

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Coffee is decaffeinated by roasting coffee beans until only about 1 percent of the caffeine content is left as only about 99 percent of caffeine can be taken out of coffee.

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It is carried out while the beans are still ‘green’. The process involves: swelling the green coffee beans with water or steam, extracting the caffeine from the beans, done with water, a solvent or activated carbon, then drying the decaffeinated coffee beans back to their normal moisture level.

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