Archaeological excavations have found purple sand artifacts with definite dates, which are now the first collections of Nanjing Museum. This is a beam-lifting pot with a height of 17.7 cm. 1965 unearthed from the tomb of Li Si eunuch Jason Wu of Majiashanming, outside Zhonghua Gate, Nanjing, with a brick epitaph, in the 12th year of Jiajing. The texture and manufacturing method of this pot can be compared with the specimens unearthed in Yang Jiao. Its carcass is similar to a tube tire, but the texture is delicate, and there are "tears of glaze on the tube altar" on the surface of the pot, which proves that the purple sand was fired in the same kiln as the general cylinder at that time, and there was no other sagger. This pot unearthed from Wu Jingzi's tomb is of great reference significance for identifying the purple sand wares made by Gong Chunsheng during his years.

Most of the purple sand wares are handed down from generation to generation, and later generations keep copying them, so it is difficult to identify the authenticity. The objects unearthed underground, especially the funerary objects of the tombs of the ages, can play a very good comparative role in identifying the handed down purple sand wares. According to the data seen in recent years, the unearthed purple sand wares can be listed as follows:

Accurate and reliable underground excavation can play the role of a ruler. Take Shi Dabin's research as an example. There are four kinds of "big guests" and "big guests" in the above table. Except one tomb from the Qing Dynasty, the other three tombs were from the tombs of the forty years of Wanli, forty-four years of Wanli and two years of Chongzhen in the Ming Dynasty.

In addition to the collection of Confucius, the collector himself thinks that the inscription of "Shi Dabin system in Wuwu Day" is eight characters, and the word "time" is connected with the word "day", which is suspicious? Quot outside, I haven't seen the questions raised by collectors. These teapots began in the 24th year of Wanli and ended in the 2nd year of Chongzhen, which lasted for 33 years. Suppose Shi Dabin was at the peak of his creative energy at the age of twenty. A round pot made of Shi Dabin was unearthed from Lu Weizhen's tomb in Zhangpu, Fujian. It is covered with a tripod, and the cultural relics include an epitaph, a silver belt, a small blue-and-white jar and an inkstone. Lu Weizhen was born in the 22nd year of Jiajing (1543) and was admitted as a scholar in the 2nd year of Qin Long (1568). In Wanli (16 10), he successively served as official seal inspector, official seal inspector and official seal inspector. The tomb of the three-legged round pot "Da Bin" in the second year of Chongzhen (1629) was unearthed in Ganlu Township, Wuxi County. The owner of the tomb, Hua Han 'e, is the grandson of Hua Cha, a bachelor of imperial academy in Ming Dynasty, and his genealogy can be found. These pots seem to be regarded as reliable standard equipment. In the eighteenth year of Shunzhi (166 1), Zhang Shu didn't say that Shi Dabin was old. According to the above assumption, he is eighty-five at this time, and it is reasonable that Shi Dabin pot has not seen the model of the year at this time. The Shi Dabin pot handed down from ancient times, regardless of its age, can be reliably identified if we can learn from the unearthed standard device for specific investigation.

There is more data value in unearthed objects. The "Man Sheng Hu" unearthed in Jinshan County, Shanghai bears the seal of Yang Zhuan Shu "Wanquan". The same seal was found on the lid of the round pot made by Guanglinghua in Tongzhi (1874).