After sending Jiao Haiqing away and letting him rest. Wei Renshi reported the matter to Li Shi the next day.

This matter has been planned for a long time, and Li Yi even agreed to make arrangements for the affairs of the sea vessels.

After going out of the palace, Wei Renshi asked Gou Er to drag him back to his home, sat in the study for a long time, drew a pattern, and then went to the glass workshop and asked the shopkeeper of the glass workshop to arrange to make some glass jars. After the order, before leaving, he also picked up a lot of ready-made ones and asked the shopkeeper of the glass workshop to send them to Weinan.

When he came out of the glass workshop, Wei Renshi asked Gou Er to drive the carriage back to Weinan.

The shopkeeper of the glass workshop did not dare to be slow about what Wei Renshi ordered, and it didn't take long for Wei Renshi and them to go back to Weinan on their front feet, and in the evening, the glass bottles selected by Wei Renshi were sent to Weinan.

"Be careful, don't break it." Wei Renshi commanded the family members to put down the glass bottles, and there were a hundred and ten of them.

"Lang Jun, what are you doing with these glass bottles?" Xi'er watched from the side and asked.

Due to the hot weather, the family is now living in Weinan, which is cooler. Wei Renshi is going to work in Chang'an, and he lives in Chang'an alone, but he often comes to Weinan.

"Make one thing." Wei Renshi said mysteriously, said that, looked at the glass bottles again, and explained to the person who sent them: "These glass bottles are just barely usable, go back and explain to the shopkeeper, I will draw the kind for him, and let him arrange to make it as soon as possible." ”

The little guy who brought the glass bottle saluted and left.

"Second brother dog, you go and call the carpenter, ask him to measure the mouth of the bottle, and go and make the cork." Wei Renshi commanded.

"Okay!" Dog Er agreed, and went to Zhuangzi to find a carpenter.

After the second dog left, Xi'er asked again: "What is Lang Jun going to do?" ”

"A food that can be stored for a long time without spoiling – well, maybe it's more like a way to store food." Wei Renshi thought for a while and said to Xi'er: "People who go far away, or who don't have green vegetables and fruits during the winter, this thing comes in handy." When the time comes, you will be able to eat Jiangnan plums in winter. ”

What Wei Renshi wants to do is canned food.

For long distances and oceans, all kinds of canned food are indispensable. The conditions on the ship are not good, and the things carried are easy to perish, even if they bring food, they are just like in the army, and they can be stored for a long time without spoiling, and as for the type and taste, it is not demanding.

Because of this, the people on the ship fell ill because they could not eat fresh vegetables, fruits and other foods, and some even suffered from serious life-threatening scurvy.

In the original history, it was precisely in order to deal with the problem that the battle line was too long, and a large number of food would rot and deteriorate after being transported to the front line, that the method of canning was invented.

In fact, the method is very simple, that is, the food will be processed, matured, and then put into the jar, put the jar in a pot of boiling water, heat for a period of time, while hot, with a cork to plug the bottle tightly. Then, the gaps are reinforced with thread and all the gaps are sealed with wax to make the can. In this way, food can be preserved for a longer period of time without spoiling.

In fact, canning is to create a sterile environment for cooked food as much as possible, and to seal this sterile environment to prevent bacteria from outside from entering the process that causes food spoilage.

The method of sterilization, when making canned food in the soil method, is to boil it in boiling water, and if possible, it can also be sterilized with hot steam. Then wrap the cork with wax while it is hot, wrap the gap between the cork and the bottle mouth with a thread, seal it with a layer of wax, and let it cool naturally.

This process of sealing while it is hot and then cooling it naturally is actually a process of hot filling. The hot filling can further eliminate the bacteria on the inner wall, and the second is that after the hot filling and sealing, with natural cooling, the bottle can also form a vacuum-like environment - although this vacuum is only a relative vacuum, not a real vacuum, but it can still play a role in preventing the formation of bacteria.

In this way, the contents of the can can be preserved for a long time without spoiling and deteriorating, and to a certain extent, it retains its original freshness.

Ocean voyages, all kinds of vegetables, fruits, canned meat, is an important source of vitamins and various nutrients for the people on board, is the pillar and guarantee for them to maintain health.

In the next few days, when the carpenter had made the cork, Wei Renshi began to try to make canned food on his Zhuangzi. The method of canning is quite simple, and in later generations, Wei Renshi also made canned yellow peaches to eat, but now there are only more steps to sterilize and seal with hot steam.

It took several days to make some canned vegetables and fruits, as well as some canned meat.

After sealing the things, Wei Renshi specially arranged for two personal soldiers to guard outside the warehouse to prevent others from touching the cans. Prepare for a limit of three months to see the condition of the contents of the can after three months.

The days flew by, and if it weren't for the occasional glimpse of the trees that had suddenly opened their mouths and their leaves quietly falling, Wei Renshi would not have realized that the season had passed from summer to late autumn.

Wei Renshi also took the batch of cans he tried to make and opened some of each.

The vegetables inside still have a crisp and tender texture, and the fruits are still sweet and tender. The cooked meat is not spoiled, but has a different flavor.

Look at the condition of the contents of the can, if you don't open it, you will probably have no problem leaving it for another three months.

That's success.

Wei Renshi found a moment, called Li Chun and Jiao Haiqing to his house together—Li Chun was the nominal leader of the royal business, and Jiao Haiqing was the principal of the maritime caravan—and then put the glass jars on the table.

Li Chun and Jiao Haiqing looked at the canned food in front of them, and Jiao Haiqing smiled: "Brother Renshi, why are the green vegetables in the greenhouse ripening earlier this year-heh!" Brother Renshi, you actually planted plums! ”

Wei Renshi smiled and said nothing, just reached out and took the bottle of canned green plums, unscrewed the lid hard, and then used chopsticks to take out the plums inside, put them in the plate, and put the plate in front of Li Chun and Jiao Haiqing, and put another pair of chopsticks on it.

Li Chun and Jiao Haiqing picked up the chopsticks, picked up the green plums in the plate, and took a bite, and couldn't help but be surprised.

Li Chun raised his head and said, "En! Sweet and sour. ”

"You try this again." Wei Renshi opened a jar and took out a cucumber from it.

Li Chun and Jiao Haiqing took a bite, and Jiao Haiqing saw that Wei Renshi didn't move, so he smiled and said, "It's delicious, it's crisp and tight." Brother Renshi, why don't you move your chopsticks? If you don't use chopsticks, I'm flustered. ”

Having said that, the chopsticks in his hand kept stopping, and he couldn't see the panic at all.