From leaf to brick
Fu zhuan is one member of China's dark-tea family. Producers start with processed tea leaf and use a sequence of preparation, pressing and drying steps to form the brick. The details differ among makers and regions. The brick form is practical for handling and storage, but it also creates conditions within the packed leaf that shape later development. Unlike a loose green tea meant to preserve a fresh-leaf profile, a Fu brick is made for a changed, deeper character.
The Chinese word hei cha is usually translated as dark tea. It should not be confused with the English category 'black tea,' which is generally called hong cha in Chinese. Distinguishing the two helps explain why Fu brick belongs beside other post-fermented teas rather than ordinary breakfast-style black tea.
The golden flower stage
During controlled warm, humid processing, the organism known as Eurotium cristatum can grow within Fu brick tea. Its small yellow-gold structures give 'golden flower' its name. A producer manages conditions for this stage as part of making the tea; it is not the same as leaving a finished brick to become damp at home. The resulting aroma and taste reflect the leaf and the whole process, not simply the number of visible specks.
When choosing a Fu brick, ask how it was made and stored, and look for clear producer and batch information. Do not use the presence of yellow flecks as a blanket safety test for any other mould.
Culture, trade and a modern tasting
Fu brick is associated with established dark-tea producing areas including Hunan. Pressed tea has long been suited to transport, and modern producers still make bricks for drinkers who enjoy repeated infusions and a mellow profile. Historical trade narratives can add context, but they do not establish the quality or origin of a brick sold today. For that, the maker and batch record matter.
If you have a sample, look at a freshly broken interior, smell the dry leaf, then taste successive cups. Notice whether the first infusion is brisk or rounded and whether later cups turn sweeter, woody or grain-like. Brew a second sample at a different strength before deciding you like or dislike the style. Our separate Fu brick guide gives starting quantities and water temperatures; this article explains why that distinctive leaf exists.