The key raw material for making inkpad is inkpad. Wei Changqing has a bottle of old stamp pad, which he got by accident. Once, when he was visiting a second-hand goods stall in Xuanwu Gate, he found a bottle of frozen old stamp oil on the stall, and the stall owner didn't know what it was. Once upon a time, there were often such secondhand goods stalls outside Xuanwu Gate, Dongxiaocheng and Deshengmen, selling old clothes, cultural relics books and exotic sundries. Wei Changqing is an expert, and he can see at a glance that this is stamp oil stored for hundreds of years in the late Ming and early Qing Dynasties. Printing oil is to press castor oil into oil, store it in a sealed bottle and leave it in the hot sun, regardless of the wind and rain. It will take several years before it can be used as printing oil. Once upon a time, a small bottle of yellow oil was often hung in the yard of a scholar's house to protect it from the sun and rain and to be used as inkpad. Wei Changqing bought this bottle of oil with very little money. Every time he made inkpad, he only dug out a small piece of frozen oil, melted it with new castor oil, and mixed it with other raw materials such as cinnabar to make the famous "eight treasures inkpad" at that time. The ratio of oil to cinnabar was calculated through his repeated experiments. If mixed properly, the seals on paintings and calligraphy will not leak oil and keep bright colors.
On one occasion, Wei Changqing asked the author to go to the Palace Museum to see paintings. Pointing to a painting by Tang Yin, he told the author that although the painting has passed for more than 400 years and the paper has changed color, the seal on the painting is still bright, because the silver ink contained in it is of good quality and the printing oil is good. All painters and painters pay attention to making good use of inkpad, so he has been pondering and studying the skills of making inkpad all his life. He doesn't know how to do "Xiling Inner School", but his "Babel Inner School" monopolizes Beijing, and it can also be comparable to "Xiling Inner School". Wei Changqing is a good collector, because he runs a lettering shop with all kinds of gem seals. He once opened the cupboard to show the author all kinds of precious lithographs, such as chicken blood, Tian Huang, fish brain jelly, etc. It was really dazzling and beautiful. For Wei Changqing, he loves stone tablets as well as stone tablets. He is often seen walking in Liulichang street with a stone tablet under his arm and a stone tablet in his hand. That's when he invited others to appreciate his stone tablet or stone tablet.