The little girl was eating candied haws in her mouth and asked curiously: "Uncle, do you think that mosquito coil is really useful?"

In fact, mosquito-repellent incense-like products already existed in this era. The realgar and mugwort were dried in the shade and wrapped tightly with paper. After being lit, it had a certain insecticidal effect. However, the duration was too short, and the smoke was choking, so it was not suitable for Shen You. It is suitable for cold patients, so I have not used it at home these two days.

"Oh, it should be possible to kill some mosquitoes by fumigation. If the dose is higher, it will be harmful to the human body." Yang Lin smiled and said casually.

After all, there is a small amount of arsenic/frost mixed in it, which is a notorious poison, so you still have to be careful when using it.

"How could my uncle know these weird things?"

"As for this, I have to talk about that barbarian from back then."

"cut……"

Putting all the blame on that unfounded barbarian was a method that Yang Lin had come up with a long time ago and had proven to be successful, so the little maid stopped asking any more questions.

After returning to the yard, Yang Lin cleaned up an empty room in the attic and put together two tables to serve as workbench. Some things that will be needed in the future have been arranged for the master's craftsmen to build them. They are currently making them. As for mosquito coils, you probably won’t be able to use those things for the time being.

Xiaoyun brought some ground starch and wood powder from outside. Just as she was about to enter, she was stopped by Yang Lin. With her puzzled eyes, she placed the bags full of dust in a spacious place.

At present, this 'laboratory' is only a dozen square meters. In such a small space, if it encounters an open flame, the probability of explosion is very high. Yang Lin died before leaving home. The experiment was not completed, so he left home. If you get blown up, how will you face your family?

Yang Lin simply explained the principle, and regardless of whether the maid understood it or not, he turned around and started his own experiment.

The principle and method are very simple, but there are still a lot of troubles in actual production, such as the preparation of dosage, the adhesion of the aqueous solution, and the final drying and baking process, which are all very unfamiliar to him.

There is still a long way to go from theory to practice. If there is a mistake in any step, you have to start over, so this is also a careful and patient process, so that he was bored all afternoon.

In the house, I kept repeating the experiment.

After the little maid watched for a while, she completely lost interest in watching and ran to embroider under the banana tree alone.

The biggest advantage of being a son-in-law is that no one will notice you, or everyone will subconsciously ignore his existence. You don’t have to do too many things, you don’t have to support the family, and people won’t expect too much from you, so you have more Spend more time doing your own things.

Yang Lin was very satisfied with this. After seeing the faces of the Shen family's relatives, he no longer had any thoughts of dealing with them. Anyway, they didn't need to have much interaction with each other. Before anything big happened, everyone would It's good to keep it this way.

After struggling for a few days, Yang Lin finally found the best mixing ratio through his perseverance, and the molds made by the craftsmen on the other side were already in place.

After the raw materials of the viscous paste are injected into the mold and extruded, the initial blank is produced, and then the final step is drying.

However, in the next few days, the entire Bianjing capital was shrouded in rainy weather. After the dried mosquito coils experienced several changes in tides, it was difficult to maintain even the most basic shape, and the effect was naturally greatly reduced.

For this reason, Yang Lin went to the shop on Yujie and asked the old shopkeeper for advice before he learned to add elm bark powder...

So on the second day after the rain and the sky cleared up, Daqian's first 'disc mosquito coil' was officially born from the Shen family laboratory.

During dinner, Xiaoyun happily walked around the house for a long time carrying a mosquito-repellent coil. After a while, most of the mosquitoes in the house had been poisoned to death. The effect was better than expected.

The key is that less than one-fifth of the entire plate of mosquito coils has been burned. At this rate, it should not be a problem to maintain it for five or six hours, which is basically what Yang Lin expected.

However, he still warned Xiaoyun that after the mosquito coils burned for a while, they should be extinguished in time. Arsenic/frost was added to the raw materials, and smelling it too much would be bad for the body.

Shen Yourong looked away from Xiaoyun in the distance, and then looked at Yang Lin in front of him, with a slightly complicated look on his face, and said, "My husband is really amazing."

Of course Yang Lin knew what she was going to say, so he laughed and was about to explain something.

But the person over there had already said for him: "That barbarian is also quite powerful."

"It's just something summarized from the experience of previous generations." Yang Lin took a sip of tea and said, "The production process is not too complicated. If it is mass produced, it shouldn't be a problem."

Shen Yourong was startled when he heard this and said, "What do you mean, sir?"

Yang Lin said: "This thing is low-cost and quick-effective. With the Shen family's methods, it shouldn't be a problem to open up sales in a short time. You are better at this than me, so I shouldn't need to teach you."

"Actually, sir, you can take it..."

"Can I exchange it for money? Or should I negotiate a deal with the old man? In fact, it's not necessary. If you can eat soft rice, you will never do it yourself. This is my life creed, and the shortest way to take advantage of others is to eat them. These are regarded as I owe it to you."

"I feel like I owe my husband too much."

Seeing the serious expression on her husband's face, Shen Yourong wanted to laugh, but another emotion took over her heart. Then she looked at the husband deeply and said, "How did my husband know?"

"Guess." Yang Lin said casually.

"My husband is dishonest."

"From the moment the old man personally came to take charge, to the reactions of others, it was not difficult to guess that something big had happened to the Shen family. At first, I thought that no matter how big the matter was, it was just a matter of spending more money, until the old man came to talk to me that night. Do you know what he told me?"

"What did you say?"

"Let me take you away." Yang Lin glanced at her and said calmly: "He wouldn't make such a decision unless he had to, or if he saw some consequences. Of course, it's also possible that he thinks I am a person Worth entrusting."

Shen Yourong looked at Yang Lin and said nothing, perhaps thinking about how this man could be so shameless and impetuous when he was praising himself.

Yang Lin smiled and said: "Okay, actually I only made some guesses, I don't know the specific situation."
Chapter completed!