Then, in the dazed looks of everyone, Bai Nuan sprayed the silver nitrate solution on Liu Nannan's schoolbag where there might be fingerprints, and then there was no movement.

Everyone: "??? "And then?

"That...... And then what? Someone asked weakly, obviously not understanding what Bai Nuan was doing.

Bai Nuan was a little tired, and she had to explain again.

"Nuan Nuan, let me explain it for you, I've figured it out." An Yang winked at her, and his smile softened.

Bai Nuan: "!! "Whoever bullies Anyang in the future, she will beat him! This kind of satisfying little brother, where to find it!

After Bai Nuan nodded, Anyang explained to the surrounding classmates.

The same students from the top class: "??? ”

"Nuan Nuan is looking for fingerprint comparison, there is no monitoring in the classroom, and the only thing that can prove her innocence is a fingerprint."

"Look at the fingerprints here and compare them." As he spoke, he showed them the schoolbag and the transparent utensils just now.

There are several fingerprints on the schoolbag, all of which are almost the same, and there are also two fingerprints on the transparent vessel, the one dotted with a black dot, which is the same as the fingerprints on the schoolbag.

Because Bai Nuan's fingers have a loop, but Liu Nannan's does not.

So it's easier to identify.

"See? Nuan Nuan didn't steal her things, and no one else even touched her school bag. An Yang smiled and looked sideways at Liu Nannan, who was so sluggish that he couldn't speak.

Suddenly, as if he had thought of something, his eyes widened, and his voice was a little sharp: "It's just the two of you who said it!" Fake, you're lying! ”

Liu Nannan's voice trembled, with a little panic.

"Teacher, could you please explain the principle?" The chemistry teacher, who was confused throughout the whole process, finally came in handy, he looked at the indifferent girl in front of him, and suddenly had a strange feeling.

She didn't want to explain, so she called him over, right?

He doesn't exist at all!

"Teacher?" Seeing the chemistry teacher staring at her thoughtfully, Bai Nuan raised her eyebrows slightly and called him.

The chemistry teacher looked at the good-looking girl and shook her head silently in her heart.

How can you think so much of him as such an excellent student!

Her students need his explanation!

"Because human hands have more or less secreted sweat, the main ingredient is sodium chloride, so the use of silver nitrate solution will undergo metathesis reaction, the generation of silver chloride precipitation, there is an obvious white precipitation phenomenon, or white marks." As a chemistry teacher, when he spoke, he walked up to the podium and wrote out the chemical equations.

【AgNO3+NaCl=AgCl↓+NaNO3】

"See? That's why fingerprints appear when white warm is sprayed with silver nitrate solution. "The chemistry teacher talked about his strengths, saying that he was not panicked at all, and he said that he was the first to speak.

This way of lecturing is more memorable than usual.

"Teacher, what about this glue? What's going on? Someone in the group of students shouted out and asked him.

The chemistry teacher glanced at the student, who was a studious activist.

"Okay, I'll tell you how this came to be today." The chemistry teacher is getting ready to speak.

Bai Nuan secretly breathed a sigh of relief, look, that's why she didn't talk about it herself.

So many words, so tired.