The difference between "Yin and Yang" in seals means:

Seal engraving is divided into two types: yin and yin. Yin engraving and Yang engraving are the two basic engraving methods of traditional Chinese lettering.

1. Yang engraving refers to inscriptions on a white background, which refers to a convex shape. It shows strokes as three-dimensional lines on a flat object, similar to relief. Ancient movable type printing used Yang engraving.

2. Intaglio, that is, white text on a red background, is a concave shape in which the strokes show three-dimensional lines underneath a flat object. Mainly used for seal cutting, seal cutting, paper-cutting, etc.

The allusion comes from:

Yu Chu Mingwen Peng's "Seal Collection·Distinguishing Yin and Yang Script": "The so-called yin and yang script in ancient times talks about its use but not its style." It means ancient times. The so-called yin and yang pattern depends on its usage, not its body.

Extended information:

Seal introduction:

Seal, also known as stamp, is used as stationery printed on documents to indicate identification or signature. Generally, seals will be stamped first. It is called a steel seal that is dipped in paint and then printed. It is not stained with paint and will appear concave and convex after printing on a flat surface. Some are wax seals printed on wax or paint, or on envelopes. The production materials include metal, wood, stone, jade, etc.

Seal types:

Warring States Ancient Seal:

Ancient Seal is the general name for pre-Qin seals. Most of the earliest seals we can see now are the ancient seals of the Warring States Period. The strokes of the seal are as thin as a hair, and they are all made of casting. Most of the ancient seals with white text are added with side bars or a vertical border in the middle, and the characters are cast or chiseled.

In addition to the names "Sima" and "Situ", the official seal also has various irregular shapes, and the content is also engraved with auspicious words and vivid animal patterns.

Qin Seal:

Qin Seal refers to the seal that was popular from the late Warring States Period to the early Western Han Dynasty, and the text used is called Qin Zhuan. Judging from the calligraphy style, it is very similar to that of the Qin and Han Dynasties, Qin stone carvings and other writings, so it is easier to understand than the ancient writings of the Warring States Period.

Qin seals are mostly chiseled with white text, often with the word "田" on the surface. They are mostly square. The official seals used by low-level officials are about half the size of ordinary square official seals and are rectangular in shape, with the symbol "日". "The character grid is called "half-pass seal".

Private seals are generally rectangular. In addition, there are also circles and ovals. In addition to the official name, name, and auspicious words, the content also includes "respect for things", "thinking well", and "harmony with everyone" Waiting for the aphorisms and idioms to be printed.

Han official seal:

Broadly speaking, it is the collective name for the official seal from the Han Dynasty to the Wei and Jin Dynasties. Compared with the Qin seal script, the seal is more neat, straight and square in structure, and has a powerful and elegant style. The handicraft industry was very developed at the end of the Western Han Dynasty, so the official seals of the Xinmang era ("Xin" was the name of Wang Mang's dynasty) were particularly exquisite and vivid, and the seal art of the Han Dynasty reached its peak.

Thus it became a model for later generations of seal carvers to learn from. Most of the official seals of the Han Dynasty were written in white, and they were all cast. There are only a few official seals that are urgently needed in the military and given to fraternal nations but are not cast, which will be introduced later.

Han private seals:

Han private seals are private seals of the Han Dynasty. They are the most numerous and richest type of ancient seals. Not only are the shapes different, both vermilion and white are available, but some are combined into one seal with vermilion and white, or are decorated with patterns such as four spirits, and then have multi-sided seals, overprints (mother and child seals), and hook seals.

In addition to the name, the seal often also includes auspicious words, place of origin, epithet, and auxiliary words such as "zhiyin", "private seal", and "xinyin". The sealing system is extremely diverse and fully It shows the ingenuity of Han Dynasty craftsmen. In the Han Dynasty, most of the private seals were written in white. In the Western Han Dynasty, chiseled seals were mainly used, while in the Eastern Han Dynasty, there were both cast and chiseled seals.

Baidu Encyclopedia-Seal