After hearing Bai Jiu's words, Xie Qi simply said, "There are many reasons for the furnace to explode. First, the spiritual power input is unstable. You don't have to worry about this problem. According to the practice method I gave you, you can input spiritual power very stably."

"Secondly, there's the issue of the ingredients themselves. This completely depends on your eyesight. Many herbs look similar, so it's easy for you to mistake them."

As Xie Qi spoke, he pretended to take out a stack of books from the ring space. Each book was five fingers thick and contained pictures of all the materials, with detailed annotations for each part of the material in each picture.

Then Xie Qi said, "Each of you take a guidebook and memorize it word for word. After you've memorized it, I'll test you one by one. If you can't answer..."

Xie Qi paused, then looked at them with a smile and said, "If you can't answer, you can just wait to be naked..."

Xie Qi ignored their petrified expressions and continued, "Third, it's the wrong ratio. You can use a medicine scale to do this. As long as you have a healthy eye, you can weigh it correctly. Once you become proficient, you can rely on your gut feeling."

"Fourth, control the heat. Well... from now on, cooking for over a thousand of us will be your responsibility, Team 2. When you're able to cook delicious dishes, you'll know how to control the heat."

"The fifth, and most important, point is that the purity is not high. As for this problem, you know a word - picking vegetables."

Everyone shook their heads when they heard Xie Qi's suspenseful words and asked, "Picking vegetables? What is it? A kind of medicinal herb?"

"Choosing vegetables means removing the inedible parts and picking out the edible parts. This can also be considered purification. I noticed that when you refine the elixir, you always put the entire herb into the alchemy furnace."

"But plants are divided into six main parts: roots, stems, leaves, flowers, fruits, and seeds. In the process of refining each elixir, some require the leaves of this herb but not the roots, while others require the flowers but not the stems. And these rotten and yellowed leaves are also not acceptable."

"So, before we cook... ahem, before we make the elixir, we must select the vegetables carefully. This way, we won't fail the elixir due to insufficient purification."

After hearing Xie Qi's words, everyone was struck by a flash of inspiration, and suddenly they understood everything. Their originally confused thoughts suddenly became clear.

However, at this moment, someone asked in confusion, "Master! How can we know the specific parts of the herbs needed to refine the elixir?"

After all, these key pieces of information had never been mentioned in any of the existing alchemy formulas, and there were countless different elixir formulas in the world. Faced with this situation, everyone felt somewhat bewildered.

But who would have thought that upon hearing their questions, Xie Qi suddenly flashed a sly smile. He calmly conjured up another thick stack of books!

At the same time, he said loudly, "Here are the detailed formulas for each elixir I rewrote! They clearly record the exact parts of the herbs needed for each elixir. Take them and memorize them carefully! Remember, in a month, I will give you a basic assessment!"

As soon as he finished speaking, Xie Qi slowly stood up, crossed his arms over his chest, and glanced at the students who were standing there with their mouths open in surprise.

Then, with a faint smile, he said, "I'm really looking forward to the assessment results in a month! I sincerely hope you won't disappoint me and make me utter that classic line: 'You're the worst class I've ever taught!'"

After saying that, Xie Qi didn't care about the miserable expressions on the faces of the students in Class 2 at the moment, and turned around and walked towards Mu Ze's class.