A, according to the shape and size classification:

1, large core: also known as single seed, generally more than 2 cm in diameter, suitable for carving single-piece works.

2. Slender core: the body is slender and the length is more than 4.8 cm, which is suitable for carving nuclear boats and designing figures.

3. Small nuclei: commonly used for hanging strings, generally with a diameter of 0.8 to 1.2 cm, which are very rare and challenge the limit.

3, round core: the body is round, mainly for facial expressions, smaller can be used as Siu Chu, bracelets.

4. Strange core: refers to the strange-looking nuclear material, which is a work of nature itself, and it is even more ingenious if it is slightly processed.

Second, according to the nuclear reinforcement classification:

1, Erhua: Usually, this kind of core is relatively flat, which is the first choice for creativity, and the output of this kind of core material is very limited.

2, Sanhua: a very common olive pit, with three tendons on the surface and many varieties.

3, Sihua: The output is relatively small, and the four ribs on the surface are evenly distributed. It is usually the first choice for Lohan and Hexian.

4, multi-flower: this kind of core is also a strange core, which is rare, and it is hard to find.

Three, according to the nuclear color classification

1, Black King Kong: the skin is black, the meat is extremely red, it is easy to make pulp, and the color is fast, so it is an ideal material for Lohan.

2, Red King Kong: The epidermis is red and the flesh color is slightly red.

3, iron round core: the epidermis is dark, the density of white ribs is high, and it is stable and easy to engrave.

4, purple core: purple skin, ordinary materials, some senior masters creative first choice.

Four, according to the nuclear storage time classification:

1, new core, refers to the period of picking the core of the element, removing the meat and storing it 1 to 2 years. Some experts think that the new core is not suitable for carving, because the water in the core has not evaporated completely, it is unstable and easy to crack, and its color is not good. However, the problems in this respect are different, and the later maintenance is also very important, and the variety of nuclear materials is also related to maturity.

2. Old nuclear materials, also known as old nuclear materials, have been stored for more than two years, but the longer they are kept, the better. It depends on the nuclear quality, maturity, fullness and interval oiling of the nuclear materials themselves. A good quality nuclear material stored for three to five years is even more powerful for senior nuclear carving masters, and is usually a hot spot for professional nuclear dealers to speculate.