Just returned to the house, Master Li came to the door again.

"Lord, these four lenses have been made!" Master Li placed the four lenses on Zhao Feng's table.

"So fast?" Zhao Feng was a little surprised, he originally thought that the glass lens would be the most troublesome and time-consuming to manufacture, but he didn't want to beat Master Li to be one step ahead of Jiang Han, and the lens was actually manufactured!

"Hehe, I added a night shift yesterday, so it's done today!" Master Li smiled, as if this overtime work was commonplace for him. In fact, it is true that as soon as the glass workshop studies something, it will definitely study endlessly, and occasionally working overtime is not a big deal!

"You guys!" Zhao Feng smiled bitterly and sighed, Zhao Feng had raised the issue of overtime work of these masters in the blacksmith shop and craftsman workshop many times, but none of the masters listened to Zhao Feng's words!

"Hey...... Hehe...... "Master Li understood what Zhao Feng was and that he had disobeyed Zhao Feng's words, so he could only laugh there and scratch his head. With this appearance, Zhao Feng couldn't laugh or cry when he saw it.

"Alright, let's go back and rest!" Zhao Feng waved his hand.

"Yes!" Master Li nodded, although he was not tired at the time of overtime, but now he feels very tired! I wish I could go back and sleep with my head covered!

Master Li left, and Zhao Feng took the lenses made by Master Li in his hand and played with them.

Zhao Feng couldn't help but sigh in his heart, the wisdom of the ancients is really infinite! How long has it been? I'm afraid that it will only be five or six years before Master Li can lead his apprentices to improve the glass like this!

I saw the glass lens in Zhao Feng's hand, and there were only a few tiny bubbles on it, which were so small that they were negligible! In addition, the color of the glass, there is only a layer of faint blue, if you don't look carefully, it is almost negligible, and only when the two lenses are stacked together, you can see the faint blue! Of course, this blue color does not affect the visual effect at all, on the contrary, it looks very comfortable!

Actually, Zhao Feng also wanted Master Li to make a few more lenses, make a magnifying glass or something, it was okay, but seeing Master Li's tired appearance, Zhao Feng immediately dispelled this idea.

"Hey!" Zhao Feng sighed, then put away the lens, got up and walked out of the study. Before leaving, Zhao Feng locked the door of the study, but he was afraid that his children would break in and break the lenses on his desk!

If that's the case, what should Zhao Fengneng do? He couldn't bear to talk about his children!

At this moment, where does Zhao Feng want to go? I saw Zhao Feng walk out of the house and come to the spinning workshop.

Zhao Feng asked the master of the workshop for a cup of black dye for dyeing cloth, what is this to do? Of course, I studied the fountain pen water used for dipping the fountain pen.

Zhao Feng originally wanted to use ink, but because there are too many impurities in the ink, even if it is dipped in a fountain pen, it is very troublesome to use ink instead of fountain pen water.

The formula of the pen water of later generations is very complicated, after all, the shelf life is not bad for ten years, but it is not something that the current process can do! In the same way, there are also formulas that cannot be reached by the current process such as freezing agents in the pen water in later generations, so after Zhao Feng finished reading the formula, he suddenly shook his head.

Zhao Feng used the system to check what can be used instead of fountain pen water. There are many answers given by the system, among which Zhao Feng found that there are two of the most trouble-free, one is in the deep sea, the ink prepared by the squid, and the other is the dye used to dye the cloth and dilute it with water.

In fact, Zhao Feng didn't know if this method was feasible, but with the attitude of trying, Zhao Feng still decided to give it a try. That's why he came here and asked for a cup of dye to take back and try it.

Back at home, Zhao Feng got into his small laboratory and began to try, according to the dilution ratio given by the system, he modulated it, observed it, and sure enough, there were many fewer impurities than the ink, but I don't know what the effect of the words written will be!

Zhao Feng decided to give it a try, so he took his homemade ink in his hand and walked towards Liaodong Academy again.

"Why are you kid coming back?" When Zhao Feng returned to the principal's office of Liaodong College, Cai Yong was cleaning the tip of his pen.

"Hehe, isn't this here to solve my father-in-law's troubles?" Zhao Feng pouted at the pen that was being cleaned in Cai Yong's hand.

"Zihu, can you solve this?" Looking at Zhao Feng's appearance, Cai Yong was a surprise, just when he was using it, he found such a huge problem: this fountain pen, the writing is smooth, but this ink does not seem to be suitable for the pen, if it is not cleaned up in time, it is likely to cause poor writing!

"Naturally, didn't I bring you ink?" Zhao Feng pointed to the ink in his hand, and then said in a very regretful tone, "But I don't seem to have come at the right time, and my father-in-law doesn't seem to welcome me!" ”

"Welcome, how can it not be welcome?" As soon as Cai Yong heard Zhao Feng's words, he hated it in his heart, but he couldn't do anything, after all, now the initiative was in Zhao Feng's hands, if he wanted the ink in Zhao Feng's hand, he must not anger Zhao Feng.

"Haha, old man Cai, old man Cai, you also have today!" Zheng Xuan watched the excitement from the sidelines and laughed.

Cai Yong didn't dare to be angry now, he just glared at Zheng Xuan angrily, and then looked at Zhao Feng with pleading eyes, and saw that Zhao Feng slandered for a while, his father-in-law really let him do anything!

"Alright, my father-in-law, I've obeyed you!" Zhao Feng hurriedly handed the cup of mixed ink in his hand to Cai Yong.

"Haha!" Cai Yong took the ink and couldn't help laughing proudly.

……

Zhao Feng and Zheng Xuan were speechless for a while.

"Father-in-law, how about you try it!" In fact, Zhao Feng was also worried, he didn't know what this kind of thing was a substitute for fountain pen water.

"Hmm!" Cai Yong nodded, dipped his pen in "ink", and then began to write on the paper.

"Not bad! Not bad! Cai Yong nodded while writing. Cai Yong is worthy of being a master of calligraphy, and after such a while, the pen writing is very beautiful!

Zhao Feng also found that the effect of writing this ink is indeed much better than that of ink, and Zhao Feng knows it in his heart.

After going back, Zhao Feng did not ask people to concoct the ink, but wrote down the recipe. Then it was placed in the study. Zhao Feng plans to use as much ink as you want, and it's a waste of more!

(End of chapter)