Don't worry about traveling through time, she has an all-powerful senior sister to help her

But then, when Shen Lingzhu asked about the price of saltpeter, the little medicine boys gave different answers. Thinking of what her senior sister had told her, that ancient people often confused saltpeter and Glauber's salt, she could only go to the medicine cabinet in front to ask the price.

Coincidentally, Doctor Sun, who had been escorting them today, was climbing the ladder of the medicine cabinet looking for something. When she asked, she found out that the prices of the two types of saltpeter were indeed different, so she said, "Could you weigh me two pounds first and put them on the bill together?"

"Miss Shen, saltpeter isn't expensive, but it's limited, especially in an important place like Baozhou Prefecture. All medical clinics and drugstores, big and small, need government receipts to buy it.

Ordinary people need to register their use with a household registration card, and the maximum amount they can get is one kilogram per month. Doctor Sun thought this little girl had unique ideas. First she asked him for sleeping pills, and now she was asking about government-controlled medicine.

He couldn't help but ask curiously, "Why do you need so much saltpeter?"

Limited control? Oh yes, nitre, sulphur and charcoal are the raw materials for making black powder, a classic plot in online literature.

But she, a sports student, didn't know how to deal with dangerous objects. Shen Lingzhu looked at the desk and saw that there was no one in line. But she still raised her hand to signal him to come down and lean in to listen. "Make ice and exchange it for money to pay for the medicine."

She wasn't worried about the clinic stealing her business, as they knew how to make ice better than she did. It hadn't been widely circulated, and except for limited quantities, they probably didn't care about the small amount of money.

Doctor Sun was slightly startled when he heard this, then shook his head and laughed, "Medicine expenses are for adults to worry about. If you, a child, go out and sell this, the street bullies alone will be able to snatch up all your iced drinks."

Besides, a pound of saltpeter can only make half a pound of ice at most. If you make iced drinks and sell them on the streets without a good reputation, you won’t be able to make much money.

"Doctor Sun, I don't sell iced drinks, I sell this method to the iced drink vendors.

They need two taels of silver to buy thirty kilograms of crushed ice, but my method can be used infinitely and only costs two taels." Shen Lingzhu raised two fingers and shook them.

As for the limited purchase of saltpeter, as long as someone thinks it is a good deal, they will find ways to buy it even if it means mobilizing all their friends and relatives.

"You want to sell it to more people?" Doctor Sun was not calm. He knew that the number of people buying saltpeter would double after the method spread.

He said hurriedly, "No, no, there are only two medical shops in the county. It would be easy for them to buy up all the saltpeter and cause a thorough investigation by the government."

"Is that so? How about you recommend one or two reliable candidates, and after paying for the medical expenses, we will have enough money to walk to Baozhou." Now she can only take one step at a time. The capital city should be big and prosperous enough, and she can choose to sell more people, or other income.

Shen Lingzhu looked at him eagerly and poured him a cup of tea diligently.

Doctor Sun was amused by her behavior, "Were you planning to ask me to introduce someone to you from the beginning?"

"Hey, you're a kind-hearted person, so I'll settle the medical bills early so you don't have to worry about it.

It shouldn't be difficult to find two families in the county who make a living from this and have good character, right?" She was unfamiliar with the place, so it would be more convenient to find someone she knew.

Shen Lingzhu just learned from chatting with the little medicine boys that Doctor Sun only sat in the clinic and did not do anything else. He often helped the poor by paying money for others, and in the end, those who could not pay back would give him some firewood or something like that as a token of his gratitude.

The owner of the clinic now maintains a 100% scrutiny of the patients he brings back, commonly known as keeping a close eye on them.

She continued, "Besides, if you act as a matchmaker, both parties will benefit."

"Then I might as well sell this secret method myself." Doctor Sun did not agree immediately, but he was already thinking about candidates.

In fact, anyone can see that Mr. Shen's family is in a very bad situation, and the chance of borrowing money is only half.

If it weren't for their status as Jinshi, the owner might not have allowed this family to stay in the clinic.

In the past, it was no big deal for him to advance a dozen or twenty cents to others, but Mrs. Shen’s money would cost her at least ten taels.

Seeing Shen Lingzhu in front of him constantly clasping her hands and bowing to praise him, he was both angry and amused. A child the same age as his daughter was begging him so much for her family, and he couldn't bear to refuse anymore.

"I actually have two candidates. Old Man Qi from the north of the city..."

Just as he started to introduce himself, three yamen runners suddenly came in at the door. Fortunately, there were no patients there at the moment.

They were quite friendly in front of the doctor, "Doctor Sun, is there a Mr. Shen coming into the city with you today?

Please ask someone to come out and go with our government office."

"Oh, Captain Luo, I don't see you very often." The shopkeeper appeared out of nowhere and invited the man to talk in the room behind the examination desk.

Shen Lingzhu took small steps and quickly moved upwards. She vaguely heard something about orders from above and that the master was in a difficult situation. Before she could hear more clearly, she was pulled to the backyard by Doctor Sun.

"You are here with bad intentions. I will ask a medicine boy to take you to find Old Man Qi, Second Brother Ruan and others in the north of the city." He did not give Shen Lingzhu and his senior sister time to explain in detail. He packed some saltpeter, called a bigger medicine boy and sent them out through the back door.

Shen Lingzhu was worried about something, so after finding Old Man Qi who was selling iced drinks at the City God Temple, he told her his purpose without any unnecessary words.

Unexpectedly, the other party was a smart man. He said that he would only sell the secret method to Dr. Sun after he had asked him to guarantee it.

Even if Shen Lingzhu said that he would get six taels for the exclusive purchase, the other party was willing to sell it without hesitation!

A quarter of an hour later, they appeared at the back door of the clinic. Someone was waiting for Dr. Sun. As she and her senior sister went to get some water, she asked, "Second sister, do you know what's going on up there?"

"We are still waiting for uncle. He said that we should leave the city quickly after he goes to the government office to verify his identity. There was an official document first and someone delivered a message today." The senior sister rubbed her eyebrows. Baozhou Prefecture is too close to the capital. There is a 99% chance that it was Mr. Shi who entered the city first to cause trouble.

She asked, "How much did you sell your secret method for making ice for?"

"The price is six taels. The person is waiting in the courtyard for Doctor Sun to act as a guarantor." As soon as Shen Lingzhu finished speaking, Doctor Sun and the medicine boy appeared at the entrance of the hall, and were held by Old Man Qi's arm while talking.

She didn't dare to go any closer to listen, and asked worriedly, "Is he bargaining because it's too expensive?"

The senior sister stared at the other person's mouth shape, and after a moment, she said, "He is afraid that a child like you will coax him. After Doctor Sun confirmed it, he asked the adults in the family to sell it out before the handover can be completed."

Shen Lingzhu: "Then some will wait."

The senior sister continued the simultaneous interpretation: "Doctor Sun said that you are not the only one who can do it, some people who read a lot can also do it. The old man kept saying that my grandson must continue to study in private school, and that if he understands the books, he can earn money.

He also asked Dr. Sun, since he knew how to do it, why didn't he teach others how to make money.

"Senior Sister, your lip reading is amazing, there was no lag the entire time.

"What did Doctor Sun say?" Shen Lingzhu leaned over to the door and looked carefully, but she couldn't understand what they were saying.

The senior sister said, “So far, the languages ​​we heard are similar, and he speaks slowly.

If I encounter dialects from other places in the future, I still won’t be able to understand them.

"Here it comes." The senior sister gestured for her to bring the tea to the table in the courtyard, then fetched a basin of warm water and a small bowl of cold water, and demonstrated to Old Man Qi how to make ice in person.