Ban Gu's Han Shu in the Eastern Han Dynasty recorded that "high slaves have water and are flammable". Gaonu is near Yanchang, Shaanxi, and Weishui is a tributary of the Yanhe River. "If water is fat, it is advisable to use it" (Notes on Daoyuan Water Classic in Li See, Northern Wei Dynasty). "Fat" here refers to oil. Around 863 AD, Duan Chengwu's Miscellaneous Notes on Youyang in the Tang Dynasty recorded that "the stone in Gaonv County is greasy and floating on the water surface, such as paint, and the burning lamp is extremely bright". "Nanshan Spring in Yanshou County, Jiuquan, Gansu Province" is recorded in the Western Jin Dynasty's Natural History (written in 267) and Notes on Water Classics. "The water is rich and moist, like gravy, and it is filled in a container. It turns yellow and then black, like a paste, burning brightly, just like paste, and the paste and water tank are very good. Others call it stone paint."
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