The liquid in the brown bottle didn't look like something drinkable.

Pei Nian naturally didn't dare to drink. He took out the mirror fragment that could contact Chu Yao and tapped the mirror three times according to the contact information she told him.

A few seconds later, he saw Chu Yao in the mirror.

She and Bai Ningle seemed to be in a dimly lit place, unable to see the surrounding scene clearly.

Pei Nian told her the situation on his side, Chu Yao motioned for him to wait a moment, and then took out three copper coins from his pocket.

Pei Nian had never seen her perform a hexagram, and he stared at the other end of the mirror. Chu Yao tossed the copper coin upwards six times, and wrote and drew on the paper.

Pei Nian couldn't understand the symbols composed of lines, but soon, Chu Yao gave him a result.

She wrote three words on the paper, namely "flavor", "fruit" and "wine".

Fruit flavors, wine flavors...

Pei Nian frowned and thought carefully for a while. Could it be that the main component of the bottle of liquid in his hand was acetaldehyde?

But how could acetaldehyde be mixed into beverage vending machines?

This must not be a coincidence. Since they were originally playing an escape room game, what he got must be props related to the mission.

He put the bottle into his coat pocket and put several coins into the drink vending machine and the snack vending machine.

Until all his coins were used up, nothing strange came out of the vending machine.

Pei Nian returned to the kitchen of the cafeteria with a few bottles of drinks and a bunch of snacks.

This time, he walked in through the door.

"Huh? You're back so soon. You're a kid with nothing but quick legs and a sweet mouth."

The air man started chattering again, "You can just take the things back and eat them yourself. Just treat it as a reward. You can find a bag to put it in."

\"You have performed well in the cafeteria these days. I will tell your director and ask him to give you more points."

"Thank you, teacher." Pei Nian quickly thanked him.

"Okay, you can go back. Remember to come and help on the parent visit day tomorrow."

As soon as he finished speaking, Pei Nian suddenly felt a strong force pushing him out of the canteen.

The sky outside also turned dark. Pei Nian looked back and saw that the doors and windows of the cafeteria were locked.

It's night again.

But he hasn't gotten the mirror fragment No. 8 yet, but he has a bunch of snacks and drinks in his hand.

However, even though he had been here for two days, he didn't feel any hunger or thirst.

Pei Nian looked at the packaging of the drinks boredly. These were common drinks on the market, nothing special.

Suddenly, he noticed the production date of the drink - 2006. He dug out other drinks and snacks and looked at them all. Without exception, they were all produced in 2006 or 2007.

The shelf life of snacks is generally two to three years, so all these drinks and snacks have expired, and they have expired for more than ten years.

"It's strange, why the expired drinks and snacks don't look rotten."

He muttered to himself as he opened a bottle of drink and took a whiff.

This bottle is orange juice. If it had been stored for more than ten years, it would have become sour and smelly.

But the bottle in his hand didn't, it still only had the refreshing scent of orange juice.

He didn't dare to drink, so he took the drink back.

Could it be that the world you live in is not 2022, but 2007?

Another possibility is that this Yuangui College is unwilling to spend money to buy snacks from the supermarket, but instead collects a lot of expired cheap snacks.

However, feeding students simple and unclean meals will only make them stomach upset at best.

Eating expired snacks may cause death.

Pei Nian didn't dwell on this problem anymore. The canteen was closed now, and he could only look for other mirror fragments.

Pei Nian followed the map's guidance and came to the second floor of the teaching building. The mirror fragment numbered "6" was in the middle classroom.

"Chemistry laboratory?" Pei Nian was stunned for a moment.

Thinking of the acetaldehyde in his pocket, wouldn't he be asked to make a mirror with his own hands?

Pei Nian hesitated for a moment and then walked in.

The walls of the laboratory are covered with chemical equations, and there are a wide range of reagents inside. Using the acetaldehyde he obtained, he can also create a "mirror".

Silver mirror reaction is a high school chemistry knowledge, and this education college mainly targets middle school students.

Therefore, Pei Nian knew the materials he needed without any effort.

He put the reagent into a clean test tube, shook it slightly, and a white precipitate appeared inside.

Pei Nian added dilute ammonia drops into it until the precipitate was just dissolved, and he got a silver ammonia solution.

Finally, he took out the acetaldehyde in his pocket, added three drops, and heated it in water.

Pei Nian set the temperature of the induction cooker to 70 degrees Celsius, and after only heating it for two or three minutes, the test tube inside suddenly burst.

Pei Nian was shocked. His operation was not wrong, but it caused an explosion.

Could it be that the bottle he got was not acetaldehyde, but something else?

He was reassured that if the experiment failed, he would have to try it again, but acetaldehyde was not easy to find.

He just looked at all the reagents in the laboratory, and none of them contained acetaldehyde, or reagents that could replace acetaldehyde.

Just as he was about to clean up the mess, Pei Nian saw a small, slightly shiny object floating in the hot water, which was the "mirror" he needed.

……

On the other side, Chu Yao and Bai Ningle also came to the teaching building.

The mirror No. 5 they were looking for was located on the rooftop of the top floor. As Bai Ningle went upstairs, she held her waist and said, "I'm really, really exhausted today... I climbed up and down several times. If I hold it With a mobile phone, the number of steps must exceed .”

"Then let's take a rest after we find this mirror?" Chu Yao suggested.

"It's okay, I'll just sit down for a while. I was thinking of going out quickly." Bai Ningle waved his hand, "I'm just sweating from crawling. I'm going to wash my face. Just wait for me."

The toilet was not far from the corridor, and Bai Ningle walked in quickly.

She couldn't help but turn the faucet to the maximum, closed her eyes, and picked up a handful of water with her hands. The cool water splashed on her face, which immediately relieved some of her heat.

Bai Ningle suddenly heard the sound of footsteps in her ears, and she asked: "Yaoyao, are you here too? By the way, do you have any paper? Give me one."

The strange thing was that Chu Yao didn't speak, but just put down a piece of paper in her outstretched hand.

"Thanks."

Bai Ningle wiped the water droplets from her face, and she inadvertently caught a glimpse of a person wearing a white skirt walking out.

In an instant, she felt as if she had been electrocuted, and her hair stood on end.

Chu Yao always likes to wear white clothes, but today in order to accompany him to escape from the room, he was afraid that a skirt would be inconvenient, so he specially wore trousers.

So, who was the person who handed her the tissue just now?

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