Coffee knowledge | what are the raw beans of Brazilian coffee?

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The four most common treatment methods of Brazilian coffee are: natural solarization, desizing, semi-washing and water washing, of which natural solarization is the most popular. Natural solarization is very popular in Brazil's two main producing areas, Serrado Minero (Cerrado Mineiro) and Mogiana Paulista (Mogiana Paulista), because the harvest season is the dry season of the year.

Natural solarization is very different from the water washing used in other Central American countries and Colombia, and since the word "Unwashed" does not fully summarize the essence of this process, Brazilians eventually chose the same term "Natural" as Ethiopian coffee. However, it should be noted that there is a difference between the natural sun method in Brazil and the traditional Ethiopian sun method. What Brazilians call "natural sun" refers to the process of picking coffee rather than the traditional treatment process, because Brazilians allow coffee to fully absorb sunlight on the branches and fully mature.

In Brazil, people put the freshly picked fruit on the terrace to dry, and the dried fruit is called "Boia" (English "ball", that is, "ball"). As I said before, all coffee is picked unpicked, so many of the coffee fruits are overripe during the drying process and dry like raisins. In more modern plantations, workers screen the coffee before drying and peel off the immature fruit by putting all the fruit in a water tank, which floats on the surface of the water because of its lighter weight. Workers can use siphon devices to remove the floating fruit. But in relatively backward plantations, workers do not have enough cash equipment to completely peel off immature fruit, which is why many Brazilian sun-cured coffee are mixed with so many immature beans.

Traditionally, sun-treated coffee usually tastes of leather, tobacco and wood, but the Brazilian natural sun gives the coffee a sweet taste and a balanced fruit aroma. Dr. Flavio Flavio Borem, from the Federal University of Lavelas (UFLA), has conducted in-depth research on the natural sun treatment of raw coffee beans. According to his theory, when using the natural sun method to treat raw coffee beans, in order to ensure the high quality of coffee, people must strictly control the metabolic rate of coffee beans in the drying process to maximize the sweetness, taste complexity and mellow thickness of coffee. Only by strictly controlling the external temperature in the drying process and the speed of fruit drying, can people ensure the integrity of coffee cell structure. In the process of drying, the cell wall of coffee cells is easily damaged. Once the cell structure is destroyed, the quality of coffee can not be guaranteed.

Next, let's talk about desizing. The desizing method was introduced to Brazil 25 years ago by Pinhalense, a well-known machinery and equipment manufacturing company. Desizing is the second most popular way to treat raw coffee beans in Brazil, and Brazilians like to call it "Cereja Descascado" ("Descascado" means "peel" and "Cereja" means "fruit"). In Central American countries, the desizing method is also known as "honey treatment". When using this method to deal with raw beans, the desizing machine is essential, and the coffee treated by this method is extremely sweet and unique in flavor. The desizing machine separates the peel and pulp of the coffee fruit from the raw beans. After completing the desizing step, people will rinse the mucous membrane on the surface of raw beans with water to the desired level before drying. What is unique about this method is that raw beans do not have to be fermented. As there is still a small amount of mucous membrane attached to the surface of raw beans, the drying process of raw beans must be fast to prevent coffee from spoiling and mildew. Once dried, raw beans are placed in a wooden box called "Tulhas" for a period of time to make the taste and aroma of the coffee more constant.

Semi-washing is now an outdated method of raw bean treatment in Brazil, which is easy to be confused with desizing, but in my opinion, semi-washing still has some uniqueness. The coffee treated by semi-washing method has a very mellow taste and high sweetness. this method requires the grower's operation technique and experience very high. if something goes wrong, the coffee will become difficult to swallow. Like the desizing method, people first use a desizing machine to desize the fruit, but the difference is that the semi-washing method requires the removal of as much mucous membrane as possible from the peel, pulp and surface layer of raw beans. In Central America, people wash the fruit directly with a washing machine after the fruit is desized, so this method is also known as "mechanical washing". The processed raw coffee beans are very clean and can begin to dry without fermentation. Semi-washed coffee dries quickly at constant temperature, so it tastes purer, less moldy and fruity than other slow-drying coffees.

Finally, let's talk about the washing method. Although many Brazilian coffee growers have recently expressed a strong interest in the washing method, the demand for this kind of coffee is still not high at home and abroad. The reason is that the water-washed Brazilian coffee has a poor reputation in the international market, and the washing technology started late in Brazil and is not yet mature. The treatment of washed coffee is very similar to that of semi-washed coffee, but it needs to be fermented to remove mucus from the surface of raw beans. Washed coffee usually has a pure taste and pleasant acidity.

These are the four most common methods of raw bean treatment in Brazil. Once the treatment is completed, only parchment is left on the outside of the raw bean, and the coffee will be finally screened to meet the quality coffee standard. Coffee beans with parchment are sent to a unified drying plant, where coffee is finally sorted, bagged and ready for export. Factory workers will first use vibration screening to grade coffee according to the density of raw beans. You know, density is one of the important criteria to measure the quality of coffee. The graded coffee beans will be cleaned again, and the cleaned coffee beans will be sent to the laboratory for final color grading. The chromometer uses a laser to detect defects or stains on the surface of coffee beans. Generally speaking, in Brazil, the level of mechanization of raw bean sorting is very high. Machining can not only avoid unnecessary mistakes, but also help solve the problem of labor shortage caused by high wages.