Dark tea belongs to post-fermented tea. It is a unique tea and has a long history in China. It is mainly produced by pressing tea, mainly produced in Anhua Hunan, Shaanxi, Hubei, Sichuan, Yunnan, Guangxi and other places . The most famous dark tea is Anhua dark tea .To identify the quality of Anhua dark tea, it depends on whether there is a âgolden flower.â âGolden flowerâ is a yellow granular bacterium, scientific name "Eurotium cristatum". â Golden flowerâ is generally found in the dark tea. The most important process of dark tea is âfloweringâ treatment. Golden flowers are common, flourishing, large in size, bright , golden, free of bacteria, which is the highest quality .