"Miss Lin, go on." The prince spoke up.

Lin Fei nodded, stretched out his hand and pointed to the drawing paper on the table, on the white paper, a round can was drawn with black ink, a three-dimensional diagram, and there was a detailed explanation of the two parts of the can split next to it: "Huang Gongzi, you see, this can is divided into two parts, the upper part is the lid, and a pull ring needs to be embedded in the lid, and the food is cooked and put into it, and then the upper lid is welded to the can." ”

"It's as simple as that?" The prince looked at the picture, such a simple iron box, there is nothing difficult to do, "So that the food will not be spoiled?" ”

"That's right!" Lin Fei smiled, "Huang Gongzi may not know that there is a creature in this world that is so special that it is impossible to see it. ”

"Mayflies!" Prince interface.

"More than a mayfly." Lin Fei explained, "Although they are the main culprits of food spoilage, no one has paid attention to them before, and the food is randomly packed in jars and baskets, and they will come and go freely, climb up and multiply in the food, so that the food will spoil." ”

The prince thought thoughtfully: "Miss Lin is really the first person, everyone is used to food being spoiled, but no one has ever thought about why. ”

It was only at this moment that the prince understood why General Shen was convinced of this Lin girl, this Lin girl was really a rare talent!

"So, we made this can to seal the food so that there could not be a single crack in the jar that the creatures on the outside that were spoiling the food could not get in." As soon as Lin Fei's words fell, the prince asked.

"But according to the girl, that thing is good at lying on the surface of food, so don't those things already have those things on the surface when they are put into the jar?"

This prince still has some brains! Lin Fei sighed, when he saw that the prince was addicted to wine, he thought it was really a straw bag, but he didn't think it was quite witty, it seems that there are two brushes to sit on the throne of the prince!

"That's right." Lin Fei replied, "So in the process of making this can, there is a key step, I only teach you, you can tell them every step when you call people to make it, but you don't have to emphasize the key role of this step, because this step is simple and inconspicuous, I don't think anyone will care except you, and this simple and inconspicuous step is the key to the success of this can!" ”

"What steps?" The prince asked.

"In the process of sealing the can and lid, the can needs to be kept in a pot of boiling water, sealed and then removed from the boiling water." Lin Fei replied, "Boiling water can scald all the things that make food spoil. ”

"If you use thin iron as a lid to seal it in boiling water, it is more difficult, and there is an easier way." Lin Fei continued, "The cans can still be made of iron sheets, and the lid can be replaced with a wooden stopper, first plug the wood stopper gently, and then tighten the wood stopper when heated in boiling water, and seal it with wax after it comes out of the pot." ”

"Wonderful!" The prince drummed the drummer, "Miss Lin is really smart. ”

"I'll call someone to start making this can tomorrow, Miss Lin, this is five hundred taels of silver, you can take it." The prince took out a heavy black wooden box.

Lin Fei took the box and took out another piece of paper from his arms: "Huang Gongzi, and this deed has to be signed by you and me."