Orthodox Manufacture: Orthodox manufacture begins by selectively picking (often by hand) tea leaves. The leaves are allowed to wither, reducing their water content and making them soft and pliable. Once withered, the leaves are gently rolled to break down the cellular structure, beginning the oxidation process. The oxidation stage is primarily responsible for differentiating tea into its various categories – white, green, oolong, and black. The longer the oxidation process is allowed to continue, the darker the leaf becomes. Once the desired level of oxidation is reached, the leaves are dried to halt the oxidation process and make them suitable for distribution. The dried leaves are then graded and sorted into various sizes: whole leaf, broken leaf, fannings (small particles) and dust.