The harvesting of coffee beans is a huge industry. Coffee is second only to oil as a worldwide commodity. Though there are dozens of bean varieties, the plants fall into two main classes: the arabica, first cultivated on the Arabian Peninsula, and the robusta which contains about twice the caffeine. The fruit is not of any interest to coffee growers. It simply serves as a protective home to the valuable seed, or bean, that it holds inside. This beans is the start for the over 400 millions cups of coffee made worldwide on a daily basis. There are two major classes of beans determined by their appearance red and green. The red beans have less acidity and a shaper aroma. They are used for the specialty coffees. One of the most important steps in producing good coffee is picking the fruit. Since most beans are hand picked by laborers, at the rate of a few baskets per day, separating the red and green is a valued skill and has a large effect on the final product. After the fruit it is soaked and scoured to remove the beans from its center. After being removed the beans are cleaned to remove any excess fruit. The beans are then laid out on the ground to dry in the sun until almost all moisture from the bean is evaporated away. From there the beans are sorted by color and size, sometimes by hand increasingly often by machine. Some of the beans are discarded, others polished to remove the skin. For select types, the beans are then aged anywhere from three to eight years, while others go to be roasted within a year. During the 400-degree Fahrenheit roasting the beans expand to about twice their dry size, crack and change color from green to brown as oil in the interior is released. It's this oil that gives the different coffees their basic flavor. Once roasted the bags must be allowed to stand so that the carbon dioxide that they produce can dissipate. Roasting is done to different degrees to produce different flavors of coffees. Kenya and Java have a technique of lightly roasting their beans and this gives their coffee bean a unique flavor.
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