All the children gathered around Jian Zhizhen, eagerly waiting for her to reveal the answer.

Chien Chih-chen smiled and asked them in return, "Actually, this is a life question. Has anyone here ever eaten okra? Or toon sprouts?"

The children all replied, "We've eaten, we've eaten."

Chien Chih-chen then asked, "When your parents cook for you, have you ever noticed that some red toon sprouts turn green after being blanched?"

As the child of a natural history blogger, Zhen Xiaohui immediately remembered: "I remember now, my dad said that some things contain anthocyanins. Anthocyanins turn red under acidic conditions, but they decompose when heated, and vegetables turn green."

Other children may not have the opportunity to enter the kitchen normally; they have only eaten there but never seen it.

Many children were very curious and suggested, "Can you do an experiment for us?"

Jian Zhizhen hesitated, "It seems there aren't any of these vegetables in the kitchen... but..."

She took out her toolbox from beside her feet and pulled out a bottle of red powder in a transparent jar: "I have something else here, although the principle is different, it can achieve the same effect."

Everyone curiously gathered around and asked, "What is this?"

Chien Chih-chen said, "This is called red blood salt."

This is what she uses to make a metal etchant.

Sometimes when inventing something, a little polishing is needed. At this time, it is inconvenient to use a saw, so a mixture of red ferrous sulfate and sodium hydroxide is used to make a metal corrosive agent that can pit stainless steel and other metal alloys.

This jar of red salt was also the main reason she asked Qin Yubai to bring the toolbox.

Jian Zhizhen looked up and asked her senior to prepare a basin of water for her.

After the water was brought over, Jian Zhizhen poured the blood-red salt into it.

After a while, the aqueous solution did indeed turn a fluorescent green.

This green color does indeed resemble a highly toxic substance. Many TV dramas depict highly toxic substances as this color because it is a color that makes people feel uncomfortable.

Bamboo Pole glanced coldly at the fat man, their eyes conveying: See? Jian Zhizhen really isn't honest! He actually made something poisonous and is planning to escape!

The fat man felt a tightness in his chest. From the moment he entered until now, his eyes had been fixed on Jian Zhizhen.

She's so beautiful; no wonder she's a female celebrity who's all the rage online.

What a pity... If she really intended to poison him, they would have pried open Jian Zhizhen's mouth and forced the poison down her throat.

Some children, seeing the color, felt inexplicably scared: "Sister Zhenzhen, is this poisonous?"

Jian Zhizhen smiled and shook her head: "Its aqueous solution is not toxic at all, because ferricyanide is very stable. If it were toxic, I wouldn't have shown it to you. At most, it might cause inflammation if it gets in your eyes."

Upon hearing this, the fat man smiled and glanced at the bamboo pole: "This girl didn't poison us, we can keep her a little longer."

Although the bamboo poles weren't perfect, they made sense when I thought about it.

Chien Chih-chen wouldn't risk so many children's lives, and she certainly wouldn't handle any toxic substances.

After explaining the science to the children, Jian Zhizhen picked up the basin of water and said, "Okay, I'm going to pour the water out. You can review the questions you just did to reinforce your understanding."

As Jian Zhizhen spoke, she stood up, carrying the basin of water.

She didn't notice that there was a little boy sitting next to her, and he tripped over her leg.

She lost her balance and stumbled forward, spilling the basin of water all over the two men.

Bamboo Pole immediately revealed a fierce expression and clenched his fists.

Qin Yubai immediately stood up, his cold gaze falling on the bamboo pole.

The other senior students also all looked towards Jian Zhizhen.

Senior Gongsun has already quietly spread the word: these two people have been confirmed to be robbers, and they may have guns.

Everyone knows that once a conflict breaks out, there will definitely be casualties.

But I would never stand by and watch my classmates get hurt!

Jian Zhizhen seemed oblivious to the tense atmosphere that was about to escalate.

She quickly went to the two men, took out a handkerchief from her pocket, and wiped them down while apologizing, "I'm so sorry, so sorry, but it'll dry in a bit. And this isn't poisonous, it won't have any effect."

Seeing that Jian Zhizhen's hands were also covered in this liquid, Zhu Gan didn't suspect that the water was poisonous.

He was simply annoyed because he got splashed with water.

He stared coldly at Jian Zhizhen for a long time before letting out a chilling laugh and saying, "It's okay, it'll dry in a bit."

The main problem is that they didn't bring any clothes with them, so they can only wait to dry them.

Jian Zhizhen then wiped the fat man's clothes as well.

Out of the corner of her eye, she noticed that the fat man was staring at her lecherously, but he pretended not to know anything.

She looked at him blankly and continued to apologize: "Teacher, I'm sorry... Here, take this handkerchief, wipe your face yourself."

The fat man took her handkerchief and wiped his face, his lewd desire intensifying, full of suggestive meaning.

Even though Jian Zhizhen didn't let him touch her at all, Qin Yubai was still very unhappy.

After a long while, he finally loosened his clenched fist, revealing a gleaming, murderous intent in his dark eyes.

Violence is the worst possible approach, especially since there are many children here.

There are plenty of ways to send them on their way without making a sound.

He suddenly asked, "Zhenzhen, I've come all this way and haven't eaten yet. Where's the kitchen?"

Jian Zhizhen turned to look at him and casually replied, "It's right next to you, go by yourself."

Their eyes met.

There's no need to say anything more.

Qin Yubai looked away, nodded, and replied casually, "Okay."

My dear reader, there's more to this chapter! Please click the next page to continue reading—even more exciting content awaits!