The little girl ate a sugar gourd in her mouth, and asked curiously, "Uncle, do you think that mosquito coil is really good?" ”

In fact, there is already a similar mosquito coil in this era, and the realgar and wormwood are dried and wrapped tightly with paper, and they have a certain insecticidal effect after being ignited, but the duration is too short, and the smoke chokes the nose, which is not suitable for cold patients like Shen Yourong, so it has not been used at home in the past two days.

"Heh, it should be okay to smoke some mosquitoes, if the dose is higher, it will be harmful to the human body." Yang Lin smiled when he heard this, and said casually.

After all, there is a small amount of arsenic/frost mixed in it, which is a well-known poison, so you should be careful when using it.

"How did my uncle know about these strange things?"

"Well, I have to say that Hu Ren back then."

"Cut ......"

Pushing everything to the unwarranted Hu man was a method that Yang Lin had come up with a long time ago, and he tried it all the time, so the little maid didn't ask any more.

After returning to the courtyard, Yang Lin cleaned up an empty room in the attic, and put together two tables to serve as a workbench.

Xiao Yun brought some ground starch and wood powder from outside, and was just about to enter the door, but was stopped by Yang Lin, and in her puzzled gaze, she put those dusty bags in a spacious place.

At present, this 'laboratory' is only a dozen square meters, in such a small space, once it encounters an open flame, the probability of explosion is very high, Yang Lin does not want to die before he can leave the school, the test is not completed, he will blow up his home, how to face his family at that time.

Yang Lin briefly explained the principle, and regardless of whether the little 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 to make, such as the dosage preparation, the adhesion of the aqueous solution, and the final drying and baking process, which is extremely unfamiliar to him.

There is still a long way to go from theory to practice, and any step that goes wrong has to be restarted, so it was also a careful and patient process, so that he spent the whole afternoon in the room, repeating the experiment.

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

The biggest advantage of being a son-in-law is that you don't get noticed, or everyone will subconsciously ignore his existence, you don't have to do too much, you don't have to support your family, and people won't expect too much from you, so you have more time to do your own thing.

Yang Lin was very satisfied with this, after seeing the faces of the Shen family's relatives, he no longer had any idea of dealing with them, anyway, there was no need to have too much intersection with each other, and it would be good for everyone to remain in this state before anything big happened.

After tossing for a few days, under Yang Lin's perseverance and attempt, he finally found the best mixing ratio, and the mold made by the craftsmen on the other side was also in place.

After the raw material of the viscous paste is injected into the mold, it is extruded into shape, and the initial blank is created, followed by the final drying step.

It's just that in the next few days, the whole of Bianjing was shrouded in a rainy day, and the dried mosquito coil strips were difficult to maintain even the most basic shape after several damp changes, 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, only to know that there was such a thing as elm bark powder......

So on the second day after the rain and the sunny day, Daqian's first plate of 'disc mosquito coils' was officially born from the Shen family laboratory.

At dinner, Xiao Yun happily walked around the house with a mosquito coil plate for a long time, and after a while, most of the mosquitoes in the house had been poisoned, and the effect was better than expected.

The key is that the whole plate of mosquito coils has only burned less than one-fifth, and 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 told Xiao Yun a few words, the mosquito coil should be extinguished in time after burning for a while, arsenic/frost is added to the raw materials, and smelling too much is not good for the body.

Shen Yourong withdrew his gaze from Xiao Yun in the distance, and then looked at Yang Lin in front of him, his expression was slightly complicated, and he said, "Xianggong is really amazing." ”

Of course, Yang Lin knew what she was going to say, and he snorted haha, just about to explain something.

But he had already said for him: "That Hu man is also very powerful." ”

"It's just something that has been summed up from the experience of previous people." Yang Lin took a sip of tea, "The production process is not complicated, and if it is mass-produced, it should not be a problem." ”

Shen Yourong was stunned for a moment when he heard this, and said, "What do you mean?" ”

Yang Lin said: "This thing has a low cost and quick effect, 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, you shouldn't need me to teach you." ”

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

"Can I exchange it for money? Or do you want to negotiate terms with the old lady? In fact, it's not necessary, if you can eat soft rice, you will never do it yourself, this is my life creed, and take people's soft hands and eat people's shortest, these are regarded as what I owe you. ”

"I feel that the concubine owes too much to the princess."

Looking at his husband's serious expression, Shen Yourong wanted to laugh, but was occupied by another emotion, and then looked at the other party deeply, and said, "How does Xianggong know." ”

"Guess." Yang Lin said casually.

"It's not honest."

"From the time the old lady came out to sit in town, and then to some reactions from other people, it is not difficult to guess that something big happened to the Shen family, originally I thought that no matter how big this matter was, it would just cost a little more silver, until the old lady 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: "If it wasn't a last resort, or if he saw some kind of result, he wouldn't make such a decision." Of course, it is also possible that he thinks that I am a person worthy of trust. ”

Shen Yourong looked at Yang Lin and didn't speak, perhaps thinking about why this person was so unashamed and impatient when he was praising himself.

Yang Lin smiled and said, "Okay, in fact, I only guessed a few, and I don't know the specific situation." ”

Shen Yourong was silent for a long time, as if he was hesitating about something, and then looked up at her husband who was a little strange in front of her, although there was a faint smile on her face, but the desolation in her eyes could not be hidden, obviously this matter had hit her deeply, and even she felt a little powerless.