How do you tell the difference between floating beans and sunken beans in coffee cherries?

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The coffee fruit picked from the coffee field can not be delayed. It must be sent to the processing plant immediately on the same day to remove the underdeveloped small fruit, immature green fruit, ripe black fruit and retain the ripe red fruit. The most simple and effective method is to pour all the fruits into a large tank. Ripe red fruits and semi-green and semi-red fruits that are about to mature are heavier and will sink under the trough, while underdeveloped small fruits, overripe rotten fruits, damaged fruits and branches and leaves are lighter in weight and float on the surface, thus eliminating floating beans that cannot be exported for domestic consumption. The sunken beans filtered by the sink sieve, that is, the better beans, will enter the next stage of treatment, that is, the sun, half-sun, half-washing or washing. Which method to adopt depends on the local climatic conditions. If the climate in the producing area is dry and lack of water, the method of extracting beans from the sun will be adopted, which is the oldest and most convenient treatment. Ethiopia, Yemen, Indonesia, Vietnam, Myanmar and Brazil often use the method of extracting beans from the sun. However, the sun treatment method is rougher, the quality is poor, and the price is generally lower, so the more advanced half-sun method was born. In recent years, Brazil has made great efforts to promote half-sun treatment, and the quality has been greatly improved. If the producing area is rich in water and the climate is humid and prone to mildew, it is not appropriate to use the sun method or half-sun method, but to adopt a full set of water washing method or half-water washing method.