Green tea is a tea made from unfermented extracted from the Camellia sinensis plant and are produced mainly in China and Japan. It is the most popular form of tea in China. The tea leaves are harvested and after collecting them they are heated by pan firing or steaming and dried to avoid excessive oxidation that would turn the green leaves brown and change its freshly picked flavor. When brewed it is generally green, yellow or light brown in color and its flavor may varies from grass-like and toasted to vegetal and sweet. Most green teas if brewed properly are light in color and gently astringent.