How to screen defective beans by hand

These impurities and defective beans will affect the flavor of coffee to a certain extent, so it is necessary to select impurities and defective beans in order to improve the quality and flavor of coffee.

Experts from China Coffee Trading Network said that before hand selection, a sieve of a certain size should be used to screen coffee beans to remove impurities and make coffee beans uniform in size. After entering the processing of the screen, it is necessary to use a tray to hold different raw beans.

There are two kinds of trays, one is a matte black tray, which is mainly used to hold raw beans, and the other is a tray with matte brown cotton paper, which is used for baking beans. According to experts from the China Coffee Trading Network, the two trays are adopted in this way because it helps to speed up the selection of beans and does not make the eyes tired.

Put the right amount of raw beans in the tray and divide the raw beans into five equal parts evenly between the index finger and the middle finger. A small amount of hand selection will help the screeners to concentrate and reduce the probability of missing defective beans.

How can we "discern the beads" and find out every defective bean? According to Fulaigao coffee experts, in order to achieve this effect, it is necessary to carefully distinguish the color and shape of each bean grain, scanning the eyes from right to left, not letting go of a trace. Over and over again, pick out the average value of defective beans that may be mixed in a tray, and take this average as data to find out the defective beans in each tray.