Tag: fucha

  • Brief historical excursus on the efforts and resilience of the Anhua people

    Brief historical excursus on the efforts and resilience of the Anhua people

    Politics clouded every public and private space in China at the end of the 70s, revolutionary inspiration raged incessantly from the large squares to the alleys of the rural dimension. The Hunan we know today, a land of extraordinary teas, has seen some of the most important Chinese political figures sit at its hickory wood tables.

    The dark liqueur, imbued with smoky aromas, was a participant in the CCP meetings, a witness to history and speeches that were never revealed. The heicha was present during the strategies of a young chairman Mao, of Liu Shaoqi, Wang Zhen, and then-Liberation Army militant Hua Guofeng, who would become the main supporter of the monumental growth of tea cultivation and agricultural modernization during the Cultural Revolution.

    Before leaving for Beijing, having defeated the gang led by Mao’s mad widow and being recognized as one of the most powerful men in China until the takeover of the Deng Xiaoping movement, he saw the acreage of Hunan tea increase from 42 to 172 thousand hectares in ten years, even if half were removed around the 90s.

    It was the heicha that warmed the souls of the soldiers during the Sino-Japanese battle of Ichigo Operation, that sustained the squadrons on days when not even the land could give relief to the dead.

    The huigan of a heicha dates back as the disenchanted voice of those who have now passed away and those who continue their work. Homeland of farmers, idealists, politicians, the look at Hunan is left to a feeling of fatigue and historical awareness that never seems to find rest.

    Initially tea was a necessity for the inhabitants of the province, planting it meant having preferential access to coal, kerosene, iron for work tools and fertilizers, furthermore the cooperatives purchased all the tea produced with advances in cash, so that farmers could purchase inputs before harvest, although often at unfair prices.

    Even today the roads that lead to Yiyang are part of an arduous pilgrimage where few still venture out, at times it seems like everything has remained still, you seem to have entered another era where in many rural villages no one will offer you a flat image for families or a little speech from a leaflet, rather a cup of tea together and lives to listen to. The people, the territory, are like their teas, a hermitage in the highlands, stranger to that sad modernist compulsion and the sadistic urbanism that seems to bypass history.

    In many homes you can still see jars containing remedies and potions on wooden shelves, alongside old ceramic and copper teapots; you are greeted by the warm whine of the kettle on the stove, the wood is now white ash, the smell of smoke still sometimes saturates the atmosphere and the drops of condensation look like tears on the windows, those little things that drag you into your corner of familiar comfort even in the most remote place in the world.

    Here, in the early Hongwu years of the Ming Dynasty, Shaanxi tea merchants opened a factory to purchase and process tea, then transport it to Jingyang. After fermentation and flowering was pressed into bricks and then sealed with hemp paper. The central government established inspection and transportation departments in Xining, Hezhou and other places in Shaanxi. Fucha was so important that to prevent tax evasion, sanctions were approved such as beheading for those who illegally left the province with tea and imprisonment or death sentence for officials who allowed their escape.

    Anhua tea traders were later empowered to transport tea on grueling and brutal journeys across the Anhua Ancient Tea Horse Road, starting from the ancient market of Huangshaping and Yuzhou, along the Zishui River, then to Dongting Lake by sail boat, and then transferred it to Shaanxi.

    However, the birth of the farmer movement and the Shaanxi-Gansu Muslim Uprising blocked tea trade routes in the northwest, resulting in a slowdown in trade and the people of Anhua found themselves without anyone to accept the import, creating a circuit of tax non-compliance that was at that point incurable. Furthermore, foreign capital took advantage of contractual asymmetries and inadequacies between sellers and the Qing government to directly purchase large quantities of cheap tea.

    The first signs of recovery came with Zuo Zongtang’s “Tea Law”, opening the doors to a new tributary system and a new and prolific tea export route, but new problems were created, however, during the political disintegration of China under the blows of the warlords of Beiyang and in the early years of the Republic of China.

    The central government’s control over local forces weakened considerably, the tea trade in the northwestern region was left to the local government which was solely concerned with the collection of tea taxes without any attention to direct control over tea market policies.

    After a slight relief from the markets due to a fiscal relief of the provisional regulation of April 1942, throughout all the 40s to the following 40 years there would no longer be much news; the social unrest, the Sino-Japanese war, the consequent destruction of the roads to block supplies and the lack of intervention in the management of the markets in Hunan caused the disappearance of this type of tea, whose presence persisted almost exclusively at a local level.

    The history of Anhua has always concerned people, going beyond politics, beyond market logic, carrying on its shoulders the weight of history and the torment that accompanies the sunset of eras, but it is certain that a new future awaits this territory, worthy of these people and their tea.

    While I’m doing this soliloquy I’m drinking a wonderful Eastern Leaves 2007 Fucha from Anhua, and I am more and more convinced of how this is a tea that more than others is a veteran of incendiary contexts, a reactionary symbol endowed with the cadence of the human voice in narrating with spiritual sincerity our past, when farmers produced tea surrounded by the metallic noise of trucks and the smell of kerosene, fixing the historical truth in the persistence of consciousness.

  • Epitome of Fuzhuan fermentation: Eurotium cristatum, the hero of Anhua

    Epitome of Fuzhuan fermentation: Eurotium cristatum, the hero of Anhua

    Despite my passion for history, anthropology and philosophy, my training background in daily life has always concerned scientific world; in particular agronomic and food technology studies have led me to be fascinated by microbiology of tea, which in the western world, however, is a subject with which we find ourselves dealing too little often.

    I will not investigate the oxidative and fermentative processes, which will be the subject of other posts, but I will speak in particular of a fungus, an extraordinary being, what I would describe as the microbiological hero of Fuzhuan. Eurotium cristatum is a very vigorous ascomycota, typical of the Hunan region, able to survive at relatively high temperatures and in situations of high osmolarity. The origin of Fuzhuan brick tea is still very controversial today, but it can probably be traced back to the Ming dynasty. Already in ancient times the jin hua, the golden flowers due to the populations of E. cristatum, were used as a quality standard for heicha bricks.

    This “flowering”, the Fa Hua, unavailable elsewhere, is a process due to the uniqueness of the microclimate of Hunan, and owes its color to the golden-yellow hue of the ascocarp of the fungus. But how does this condition arise, and how does it affect the taste of the tea?

    The creation of Fucha is one of the most complicated production processes among dark teas, which involves three particular fermentation stages that differentiate it from the others. Once the rolling phase (sometimes 2 rolling phases) of the leaves has been completed, which favors the rupture of the cell membranes favoring the biological processes, the leaves are processed at a temperature between 100-200°C (depending on whether it is pile steaming or other methods), creating a selective condition (about 90% of fungi and bacteria are killed).

    Follows a piling phase, a pre-fermentation phase in which the leaves are placed in piles and the temperature is lowered below 60°C and moisture content of 65% to 68% to favor microbial proliferation, creating an initial selection for some species of microorganisms.

    The loose leaf tea is therefore left as raw material stage, the pile is turned at certain intervals. The reactions will take place and will develop the scent of the tea, such as various types of degradation of amino acids or hydrocarbons, Strecker degradation, enzyme-mediated oxidation and hydrolysis, as well as non-enzymatic degradation and oxidation. The pile fermented leaves were then dried; in old days the drying process was done in an oven with pinewood at around 70°C. Raw Fucha is now ready.

    All this will end with the subsequent steam heating of the leaves at around 80°C and piled up again throughout the night, to make them suitable for pressing and further determine a selective environmental condition. At this point the pressing in bricks will take place once the temperature has reached 50°C and the bricks stored so that the third phase can begin, the flowering phase, known as fahua, under controlled moisture and temperature for at least 15–25 days, which marks the post-fermentation events.

    We always keep in mind that these procedures, times and temperatures can vary according to the recipe and the various traditional methods.

    Phases of a typical production process: (1) Fresh tea leaves, (2) Shaqing, (3) First rolling, (4) Pile fermentation, (5) Possible Second rolling, (6) Drying, Raw Fucha is ready, (7) Screening and sorting, (8) Blending, (9) Pile steaming, (10) Second short pile fermentation, (11) Pressing, (12) Fa Hua, Microbial fermentation, (13) Packaging and storage

    E. cristatum together with other microbial agents acts on tea leaf molecules thanks to the activity of extracellular enzymes produced by fungal fermentation, such as α-amylases, polyphenol oxidase, cellulase, pectinase, xylanase, proteases and hemicellulase oxidase, contributing to the change of volatile substances and bioactive components during the fermentation process.

    The dominant genres of microorganisms identified were Eurotium, Debaryomyces and Aspergillus, and three genres of bacteria such as Klebsiella, Lactococcus and Bacillus. Although all microorganisms contribute to the flavor profile, Eurotium cristatum was found to be deeply characterizing.

    The degradation of proteins and polyphenols, as well as the production of metabolites, carbonaceous and nitrogenous compounds due to the action of E. cristatum and associated microorganisms lead to the formation of the distinguishable fungal and woody aroma of Fuzhuan tea, of stale, mentholated and undergrowth perception.

    Furthermore, the traditional brick form must not be understood as a casual or merely hedonistic and cultural process, it has in fact emerged that the differences in the structure of the bacterial community between the different types of Fucha can be in part mainly attributed to the different degree of compression of the material.

    Notable differences emerged in the microbial community in its taxonomic diversity and population size, in loose, unpressed, lightly pressed, hand-pressed, or machine-pressed Fuzhuan tea leaves. They all influenced the fermentative development in their own way, creating different tissue damage, thus modifying the release of leaf cell contents. This in turn plays an important role in influencing the subsequent fermentation stage.

    The results consistently indicated that machine-pressed Fuzhuan tea contained the highest abundance and diversity of microorganisms.
    The excessive mechanical damage caused by the strong pressing causes a greater degree of rupture of the membranes which is followed by a considerable release of the intracellular contents, as well as affected the humidity and air circulation inside the brick, significantly promoting the growth and the development of colonies of microorganisms.

    The result is that the endogenous enzymatic and non-enzymatic action of the leaves, and to a greater extent the exogenous one of the microorganisms, leads to polyphenolic oxidation with a consequent greater production of thearubigins which characterizes the dark color of this heicha; the reactions involving polyphenols, carbohydrates and amino acids affect the silky texture and volatile compounds, as well as the oxidation of fatty acids.

    The metabolic activity of eurotium cristatum and of the other microorganisms attenuates the green, herbaceous sensations, being replaced by floral, woody, stale ones towards the last part of fermentation, due to molecules such as methyl salicylate, derivatives of hexanol and of trimethoxybenzene. Furthermore, the gustatory characteristics are also changed.

    Cathechins like EGCG, GCG, EGC, CG are positively correlated to the sensation of astringency, acidity and bitterness. It has been seen that during the fermentation process these substances tend to decrease proportionally to the microbial development and its metabolic activity, it can therefore be deduced that the latter is related to greater softness, less astringency and a higher sweetness with the continuation of the tea aging.

    We have reached the end of this scientific journey into the world of this little golden wonder.

    I remain available for further curiosities or material in case you want to learn more about the topic.