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Coffee beans are first softened in hot water or steam. Then caffeine is dissolved from the beans by using a solvent such as methylene chloride, ethyl acetate, or a gentler solvent such as water itself.
Liquid carbon dioxide is a much more expensive alternative, but has the added advantage that it does not remove the flavour molecules.
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The solvents used to obtain decaf coffee also remove some of the flavour molecules. These are then added back.
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