Temporarily tethered the foal to the side, Li Chunfeng came to the backyard, and from a distance, Li Chunfeng found Sun Simiao sitting on the stone table in the backyard, as if he was studying something, only to see Sun Simiao holding a book in his hand, glanced at it, pondered for a moment, and then reached out to play with the things on the table.

"Sun Weng, what are you doing here?" Li Chunfeng walked over curiously and sat aside.

I only heard Sun Simiao's very serious answer: "Alchemy." ”

"Alchemy?" Sun Simiao's words made Li Chunfeng's buttocks "bounce" again when he just sat down, "Sun Weng, get out of there quickly!" ”

"Why?" Sun Simiao looked at Li Chunfeng and found that he was nervous.

Li Chunfeng looked a little excited, and said, "Don't practice, it's going to explode!" ”

In Li Chunfeng's memory, he clearly remembered that gunpowder, one of China's four great inventions, was discovered by a group of Taoist priests after the explosion in the process of refining the elixir. Therefore, when Sun Simiao talked about alchemy, Li Chunfeng's first reaction was to explode.

"Explosion?!" Sun Simiao was even more puzzled, "The old alchemy has been alchemy for more than ten years, and there has never been an explosion. ”

"Didn't explode?" Li Chunfeng was stunned for a moment and muttered, "Could it be ...... Am I making a big fuss? ”

Doubting the letter, Li Chunfeng returned to the stone table, and while carefully leaning over to watch Sun Simiao fiddle with the things on the table, he asked, "Sun Weng, what are you refining?" ”

"Sulfur water."

"Sulfur water?" As soon as he mentioned the word sulfur, Li Chunfeng thought of the ingredients for making gunpowder.

Sun Simiao said to himself: "Go up the mountain to collect medicine, there are a lot of snakes, insects and rat poison on the mountain, and sulfur water can be used to dispel snakes." ”

"Whew! - It turned out to be dealing with snakes," Li Chunfeng breathed a sigh of relief, "I thought it was gunpowder." ”

"Gunpowder? What is the medicine? ”

Li Chunfeng hurriedly sloppy eyes: "Ah, it's nothing, it's nothing, by the way, Sun Weng, what kind of book are you holding in your hand?" ”

"Li Lang, you said this book, this is the scripture of the "Thirty-six Water Laws", and the refining method of sulfur water is taken from it."

Li Chunfeng nodded: "There is such a magical book." ”

"Chunfeng, you're here to help me." Sun Simiao said, "The light is too dim, and the old man can't see clearly, so you can match the amount for me." ”

"Oh, good."

The sun had already set, and only relying on the last afterglow, Sun Simiao's presbyopia was a little difficult.

"Take a pound of sulfur, a liter of mulberry dew in August, and two taels of saltpeter."

There were weighing tools on the table, and with the help of Sun Simiao, Li Chunfeng took the full amount of sulfur, saltpeter, and mulberry dew respectively: "Sun Weng, what should I do next?" ”

"Put it in that bamboo tube and seal it with lacquer."

"Oh."

Li Chunfeng carefully put sulfur and saltpeter into the bamboo tube, and then sealed it with raw lacquer according to Sun Simiao's instructions.

After all this, the sky was almost dark, Li Chunfeng handed the bamboo tube to Sun Simiao, Sun Simiao nodded: "Okay, put it in the pool, and it will become sulfur water in a few days." ”

"So amazing?" Li Chunfeng said, "Don't you need to roast it on fire?" "I remember watching those old ways on TV that all use alchemy furnaces, why did you go to Sun Simiao's place and switch to water blisters?

"This is the water refining method," Sun Simiao looked at Li Chunfeng with a curious expression, "Use fire?" Why does Li Lang have other refining methods? ”

Li Chunfeng shook his head: "No, I'm just hearsay." ”

"The five elements restrain each other, and using fire to refine the pill may have unexpected effects," Sun Simiao said, "When Li Lang said this, he reminded me that when I have time, I can give it a try." ”

Looking at Sun Simiao's extremely serious and courageous spirit of exploration, Li Chunfeng would not doubt his determination at all, and secretly said in his heart: "Hey! Why do I have this mouth......"

History has proved that countless great discoveries and inventions need enlightenment...... For example, Newton was hit on the head by an apple, which indirectly helped him study gravity.

Sun Simiao was inspired by Li Chunfeng and laid the foundation for the later discovery of the fire alchemy method, which was the key to the discovery of gunpowder.

Back to the present, Li Chunfeng packed up the things on the stone table, hugged them in his arms, and followed Sun Simiao to a well in the courtyard.

"The pool has been abandoned, so let's use the basin for the time being," Sun Simiao said, "Chunfeng, you can help me get it." ”

After that, he handed the bamboo tube to Li Chunfeng's hand, and Sun Simiao pulled out a bucket of water from the well.

The well water was poured into a large wooden basin, and Sun Simiao said, "Give me the bamboo tube." ”

"Okay."

Li Chunfeng stretched out his hand to hand over the bamboo tube, and accidentally, the saltpeter he was holding in his arms suddenly spilled out.

"Whoa-la-"

When the saltpeter entered the water, there was an immediate violent reaction, and the water in the barrel seemed to be boiling, and it continued to splash in all directions.

Li Chunfeng couldn't help but be embarrassed: "A moment of miss, a moment of miss." ”

"It's okay," Sun Simiao smiled slightly, not taking it to heart, "Just refill the bucket." ”

After speaking, Sun Simiao put the bamboo tube aside, and pulled out a bucket of water from the well, during which Li Chunfeng also put the things in his hand aside, and then picked up the wooden basin and wanted to pour out the water in the basin.

But when Li Chunfeng's hands touched the wooden basin, there was a cold feeling, which made Li Chunfeng startled and looked at the wooden basin carefully.

The saltpeter had completely disappeared, but at the edge of the tub, faint ice crystals appeared.

"Ice?" Li Chunfeng was taken aback, although it was already autumn, the temperature was far from the point of freezing, and at this moment, ice crystals appeared on the edge of the wooden basin, which was naturally related to the saltpeter just now.

"Saltpeter? I remember," Li Chunfeng suddenly remembered, "In chemistry class, the teacher once said that the ancients already knew how to use saltpeter to make ice!" ”

Sun Simiao saw Li Chunfeng holding the wooden basin in a daze, and said, "Chunfeng, is there anything wrong?" ”

Li Chunfeng was a little excited in his heart, and said, "Sun Weng, come and see, Bing!" Ice! We've discovered a way to make ice out of saltpeter! ”

"Ice?" Sun Simiao said, "Li Lang, this winter has not arrived, where did the ice come from?" ”

"Really, I don't lie to you, you come and see."

Sun Simiao stepped forward suspiciously, stared at it for a long time, but found nothing, and couldn't help but raise his head and ask, "Li Lang, where is the ice you are talking about?" ”

"Huh?" Li Chunfeng looked down and saw that the Xiaoice crystals just now had disappeared without a trace, obviously those ice crystals had melted away, "Sun Weng, do you still have saltpeter?" I'll do it again for you. ”

"Saltpeter?" Sun Simiao said helplessly, "It's all in the basin just now." ”

Li Chunfeng was a little speechless: "......"

Even if Sun Simiao didn't believe it, Li Chunfeng was still full of confidence, it wasn't that he was wrong just now, it must be ice! Suddenly, Li Chunfeng Dao had a good idea in his mind to get rich.