C660 Gold Problem

"Elder Ji, what about the raw material?" Hee Tian thought of this problem. Naturally, the dragon head could not ignore this problem. In fact, this was the most important part of it.

"Other than the list I gave you, the other raw materials also need three types. The first type is ink! Carbon ink. In the coal mine, one meal can purify up to ten kilograms! This technique was perfect and mature