Just do it, Zhao Yuan is a man of action, with the complete production method of high-quality ink and high-quality paper in mind, what Zhao Yuan has to do is to try to find the materials he needs.

Some materials that are really not found under current conditions need to be found to be alternative.

(Sorry, it's going to be a few days off!) ）

Chapter 228 of "The Great Song and Little Landlord of the Crossing" is in the middle of the hand, please wait a while,

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