How to deal with wormholes in coffee beans bought? are there any black beans to pick out from coffee beans?

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How to choose defective coffee beans

Before selecting defective beans, raw beans need to be screened in order to make the beans uniform in size. You can use three different sizes of special custom screen, or you can use the metal screen sold in general horticultural shops, but pay attention to the size. The purpose of sieving is to separate the size of beans and remove impurities.

The next step is hand-selected. In order to improve the efficiency of hand selection, some props must be used, among which the necessary is the pallet selected by hand. There are two kinds of trays to be prepared, one for raw beans and one for baked beans with matte brown cotton paper. In the case of a large number of beans to be selected by hand, such a tray can keep the eyes from fatigue.

The steps to select defective beans are as follows:

1. Put the right amount of raw coffee beans on the tray. The key point is the right amount, too much or too little is not good. Spread the raw coffee beans on the tray and divide the raw beans on the tray into five equal parts with both index fingers and middle fingers. A small amount of hand selection is less likely to miss defective beans and easier to concentrate.

2. Select the raw coffee beans until they are flawless.

3. Don't just stare at the side with beans, but pick it up to see its color and shape. Don't miss any one, move your eyes from the right to the left.

4. Repeat the same steps again and again.

5. Know the average value of picking out defective coffee beans.

If you pick out five or six defective beans in a tray, use this as the average to hand select the next tray.

The order of selecting coffee defective beans is "color-> luster-- > shape".

When selecting raw coffee beans, beans with uniform shape, thickness, size, color, central line and so on are the best, especially the unripe beans are difficult to be removed by machine and must be removed by hand. And these unripe beans will have a very bad effect on the taste of coffee. In addition to immature beans, there are dead beans, worm-eaten beans, black beans, moldy beans, shell beans, fermented beans, broken beans and shell beans.

Beans of different colors. Figure out the basis for color selection, and then put the coffee beans of the same color together.

Beans with different gloss. You can pick out dead and unripe beans according to the luster of coffee beans.

Beans of different shapes. Shell beans have a slight effect on the taste, so put it at the end of the treatment.

After the hand selection sequence of 1 to 3 becomes familiar, the overall judgment can be made. In this way, the speed of picking defective beans can be improved, and you won't get tired after working for a long time. The most important thing is to do it with both hands. The speed of hand selection will be faster, but it is also easy to be tired and unable to support the selection of defective beans for a long time, so it is recommended to choose with both hands.

Raw coffee beans in coffee beans are round beans considered defective beans?

Round beans / public beans, also known as Peaberry, or Peaberry or caracoli in English, is a variety of coffee beans. In fact, the male bean is a flaw, officially speaking, it is not a normal development of coffee beans. The causes are usually caused by insect damage, lack of rain in case of prolonged drought, or malnutrition of coffee trees.

Some coffee drinkers think that peaberry has a stronger aroma because normal coffee beans should have two seeds, but public bean coffee is particularly hypertrophic because one of the seeds is stunted, and because it gets double nutrients, it tastes better than mother bean coffee and is sometimes sold at a high price because of its rare nature. In contrast, the beans are sometimes classified as defective beans and discarded in different coffee producing areas.

If a whole batch is round beans, we classify them as defective beans. If a whole batch is flat beans, a small number of round beans should be removed. Moth-eaten beans and black beans are first-class defective beans, so they need to be selected.

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