Coffee beans have the same characteristics as those of coffee beans.

1. The seed coat of small fruit coffee has been removed, oval or oval in shape, 8-10mm in length, 5-7mm in diameter, 3-4mm in thickness in the middle, raised on the back, flat on the ventral surface, with slightly curved longitudinal groove and paper seed coat marks. Raw products are yellow or dark green; baked products are dark brown with special aroma and slightly bitter taste. Astringent. Coffee flower

2. The seeds of medium fruit coffee are slightly larger, ovoid, 9-11mm long, 7-9mm in diameter, raised abaxially and flat on the ventral side.

3. Coffee seeds with big fruit are oblong, about 15mm long, about 10mm in diameter, smooth.

Microscopic identification: small fruit coffee seed powder characteristics: the raw product is yellowish green and the baked product is brown.

① has many brown lumps of different sizes.

② fiber is slender.

③ stone cells are rectangular and round, with a length of 200 μ m and a diameter of 20-40 μ m.

④ endosperm cell wall is thick, pit can be seen, containing protein grains and fat. Physical and chemical identification to take a little powder of this product, put on the slide, add a little water, heat, wait for the water to dry, add 2 drops of benzene, after drying, there are many yellowish needle crystals along the edge of the slide. Check for caffeine.

In addition, coffee trees can be divided into two main varieties: Arabica (Coffea Arabica) and Robusta (Coffea Robusta/Coffea Canephora). There are also some minor species, such as the Liberian species (Coffea Liberica) and the Alabasta species (Coffea Arabusta), but they are rare on the market.

There are also two processing methods:

1. Dry method: after the fresh fruit is dried or dried, remove the pericarp and seed coat with a sheller and sift out the impurities.

2. Wet method: this method is used for mass production. Peel the fresh fruit with a peeling machine, separate the bean grains from the pericarp, soak the peeled beans in water, wash, dry, and then remove the seed coat to get commercial coffee beans.