C583 method of absorption of essence

Long Tianyu took the silk from Wan'er's hands, and looked at the map on top of it, with the points on it and the other half with the shapes and notes of the rocks, with the words saltpeter, sulphur, charcoal, etc. He was ecstatic, and asked: "Have you found the saltpeter and sulphur?"

Chunyu Wan'er said, "These ore elements were mentioned among the ancient alchemists