The sun is rising higher and higher, and Chang'an City is gradually becoming lively.

After breakfast, the two walked on the way to Xishi, and Li Chunfeng asked, "Xiaodao Chief, what's your name?" ”

"Li Da Niu, you can just call me Da Niu." The little Taoist priest smiled innocently, "Hehe, what is your name, Lang Jun." ”

"Li Chunfeng."

"Wow, what a great name," Li Daniu said enviously, "Your name is much better than mine, and I have to change it to a better name." ”

Li Chunfeng was stunned: "Can you change your name at will?" ”

Li Daniu smiled: "Since I was a child, I have no name, in the Taoist temple, the master only called me the Taoist number, and then the master died, the Taoist temple handed over to me to take care of, sometimes I need to be officially inspected when I enter the city, so I took a name myself." ”

"Notarized?" Li Chunfeng was stunned, he had heard of wild geese, wild geese, and falling geese, but it was the first time he had heard this song to be public.

Li Daniu took out something from his arms and handed it to Li Chunfeng: "That's it." ”

Li Chunfeng took it and looked at it, but it was a hard note, which wrote Li Daniu's residence and living situation, just like a modern identity certificate, to put it bluntly, it is equivalent to a modern ID card, since it is an identity certificate, it naturally has a name.

"Do you need this thing to get into the city?" Li Chunfeng was stunned, why was there no one to check the last time he and Master went in and out of the city gate?

Li Daniu shook his head: "It's not every time it's checked, it's only checked occasionally, but if you don't have this thing during the inspection, you won't be allowed to enter or leave the city." ”

"Oh, I see."

Under normal circumstances, the inspection is not strict, only in wartime, in order to prevent the enemy from sneaking into the city, the inspection will be stricter, and under normal circumstances, it will only be occasionally sampled.

returned the official inspection to Da Niu, and when they looked up again, the two of them had unconsciously arrived in front of the medicinal herb store that Li Da Niu said.

"Here we are." Da Niu smiled, "When my master was alive, he often came here to buy alchemy materials. ”

"Your master also uses saltpeter for alchemy?"

"Well," Da Niu said, "Master refines some elixirs that prolong life, and if you think it's good to take them yourself, you will sell them to some rich people in exchange for some money, but after Master passes away, no one will refine them." ”

Hearing what Da Niu said, Li Chunfeng secretly said in his heart: "It seems that Taoist priests are very keen on alchemy." "Even Sun Simiao knows some alchemy methods, which shows that alchemy is very popular among Taoist priests.

However, this Li Daniu's master is too bold to test the medicine himself every time......

The two stepped in, the pharmacy was not big, because it was morning, so there were still fewer customers, and the boss was sitting on the side and napping.

At this moment, seeing a guest coming to the door, the owner of the pharmacy got up and came over enthusiastically to greet him: "Two Xiaolangjun, I don't know what medicinal materials you want to buy?" Ginseng? Velvet? Ganoderma lucidum? ”

The boss skillfully sold with Li Chunfeng, and automatically ignored the shabby-dressed bull.

Li Chunfeng looked around and asked, "Do you have saltpeter for sale here?" ”

"Saltpeter?" The boss was stunned.

"No?"

"Yes, of course there is," the boss glanced at Li Daniu over there, saw that he was dressed as a Taoist priest, and said, "Two Taoist leaders, do you want to use saltpeter for alchemy?" In addition to saltpeter, fritillary and bear bile are also good for alchemy. ”

"Let's get some saltpeter first, we don't need the rest for the time being."

The boss said, "Okay, wait a minute, two Lang Jun." ”

With that, the boss turned to the shelf, reached out and took a bag of things from the shelf, and opened it to see that there were some colorless, white or gray crystalline things, faintly shining like glass.

These saltpeters are not much different from what Li Chunfeng saw from Sun Simiao yesterday.

"How much do these saltpeters cost?" Li Chunfeng asked.

The boss smiled: "Lang Jun, if you want it, you can take these saltpeters for fifty yuan." ”

"Fifty wen?" Li Chunfeng only has more than 30 copper coins on his body, and all of them were given by Yuan Tiangang, fifty yuan, he really doesn't have so much.

Fifty yuan is not a small amount, Li Chunfeng said: "I don't have so much money on me, so let's take half of these saltpeters for me." ”

"Okay, Lang Jun wait."

With that, the boss turned around and began to weigh it skillfully, and in a short time, a bag of saltpeter had been split in two.

Handing the saltpeter to Li Chunfeng, the pharmacy owner said, "Lang Jun, this is the saltpeter you want, a total of twenty-five yuan." ”

"Thank you," Li Chunfeng nodded, took out twenty-five cents from his arms and handed it to the boss, and then asked casually, "Boss, how many saltpeters are there in your store?" ”

"Saltpeter, except for people like Dao Chang, ordinary people don't buy much, so we don't have much inventory here, and what I showed Lang Jun just now is already all in the store."

"Thank you."

Leaving the pharmacy, Li Chunfeng thought as he walked, if you want to use saltpeter to make ice in large quantities, the saltpeter needed is very large, and if it is supplied by the pharmacy, it is obviously not enough to meet the demand.

Moreover, the price of saltpeter is relatively expensive, and the ice produced is obviously not something that ordinary people can consume.

Although Chang'an City has a large population, there are not many wealthy people, which means that the demand for ice may not be as great as imagined.

"Uh...... Li Lang, did you buy these saltpeters for alchemy? The big cow on the side asked.

Li Chunfeng thought for a while, didn't tell Da Niu his true purpose, just nodded and said, "Well, there is this idea." ”

"Great," Da Niu actually smiled, "Li Lang, if you learn alchemy, can you teach me?" I didn't study hard when Master was alive, so I ......"

Li Chunfeng was stunned for a moment, looked at Da Niu's expression of wanting to speak and stopped, and nodded: "If I succeed, I will definitely teach you." ”

"Thank you, thank you!"

Da Niu thanked him again and again, but Li Chunfeng remembered something else and asked, "By the way, since your master was alchemy during his lifetime, you should have all the tools for alchemy." ”

"Yes, all of them."

"That's good," Li Chunfeng said, "I want to borrow the place and tools of your Taoist temple." ”

"No problem, no problem." Da Niu promised again and again, "You come with me." ”

So, under the guidance of Da Niu, Li Chunfeng walked out of the east gate of Chang'an City, and then walked towards Li Da Niu's Taoist temple outside the city.

Li Chunfeng chose to conduct saltpeter experiments in Da Niu's Taoist temple, firstly because he wanted to use his tools, and secondly, because he needed to keep it secret.

In Li Chunfeng's view, the honest Li Daniu made him the most assured, and the Taoist temple was outside Chang'an City, even if he made any big moves, it was not easy to attract people's attention.