In order to get decaff coffee, you have to find a way to decaffeinate it. Decaff coffee dates back to 1903, when benzene was used as a solvent to strip caffeine from the bean. Though this method isn’t used anymore, it did lead to other methods that could give coffee drinkers more options.
Coffee can be decaffeinated using water, where the blended green coffee beans are immersed in hot water to draw out the caffeine. The coffee is then dried before roasting.
Other methods such as super-critical CO2 are also used to strip caffeine from coffee beans.