1. Single-sided drilling, also known as "horseshoe hole", starts from one side, and the aperture becomes smaller and smaller. The whole hole sample presents the appearance characteristics of arrogance at one end and narrowness at the other end.

2. Double-sided drilling: start drilling from one side, and drill from the other side of the corresponding position after hitting the middle position. After drilling, the hole is stepped, and the whole hole is in the form of big at both ends and narrow in the middle.

3, pipe drilling, evenly drilling up and down, the hole is spiral, by the late Neolithic age, jade processing technology has improved a lot, from plain surface to simple line pressing relief technology.

A typical animal face pattern has appeared, and the animal face pattern technology is mainly based on simple relief, and the color and nose are raised. This technique is a relief technique developed from the yin line pressing technique.

Extended data:

The main points of appreciating ancient jade:

People in China have always liked beautiful jade. Formally, the characters beside the word "Wang" are all kinds of beautiful jade. In this case, it is estimated that there are dozens or hundreds, which shows people's love for Meiyu.

As for the poems that eulogize Meiyu, there are countless poems, such as "Yan Ruyu in the Book", which is comparable to Meiyu; And "what are bells and drums, delicacies and treasures?" , indicating wealth, and of course "keeping chastity", indicating chastity.

Mei Yu Can is very popular, and collecting plum rains is also the favorite of China people. It is extremely common to have jewels at home. Some friends talk with their necks. Gold necklaces were popular in the 1980s and 1990s, and jade articles were popular in the 21st century.

Some jade lovers not only wear jade cards around their necks, but also jade beads on their wrists, and even jade pendants jingle on their leather belts.

I'm not sure about the age of the ancient jade. Only a few people can master this kind of professional knowledge, commonly known as zhangyan, that is, several jade experts in the museum can master it. Ordinary people don't even play with the real thing, so they can't tell the difference between true and false. So there is a saying in the collection that it is better to buy new jade than ancient jade.

I'm not sure about the new and old jewels, just buy a new one, and the new one is always cheaper than the old one. This is the view of most collectors on playing with jade.

Even the new jade, as long as the craft is exquisite and the jade material is excellent, still has great collection value, and those jade articles with high imitation on the market are still loved by collectors.

Of course, science and technology are constantly developing. When you don't find your favorite jade, it's better to buy some fine hetian jade, which is rare or equivalent.

As a precious jade that is a non-renewable resource, some people think that the price will only go up and not fall. Therefore, it is better to buy new materials than to buy new materials.

References:

Baidu encyclopedia-ancient jade