I didn't expect there was saltpeter here, which is an important component for making black powder.
The formula of black powder is one saltpeter, two sulfur and three charcoal. As long as the black powder can be made, it can be used to blow up the blocked cave wall.
Saltpeter is available, charcoal is even simpler to obtain, and as for sulfur, that is readily available.
Don't forget the hot spring water in the stream. The hot spring water is usually rich in sulfur.
There is probably a volcano under the ground here, which is probably why there are so many hot springs. Where there is a volcano, there is naturally sulfur.
After gathering the three materials, Su Yin began to make it.
The first time it didn't work.
The second time, there was a crackling sound, but it quickly died down.
Su Yin stroked his chin, wondering how to mix the ingredients.
Although the formula is available, when you actually put it into practice, you will find it difficult. Of course, there is another possibility, that is, the material she used is not pure enough.
But now the conditions are limited, and we can only try to mix the most reasonable ratio to make the black powder exert its greatest power.
As for whether he was worried about blowing up the mountain, Su Yin was not worried at all. The reason was that if he wanted to make gunpowder of that power, he couldn't just pick up some materials randomly.
She still has this self-awareness.
Su Yin was making arrangements outside the cave, while Uncle Huo was in charge on the side. As for the other three, they couldn't sit idle either, and began to use other methods to prepare to break open the sealed cave entrance.
Due to the problem of material purity, black powder could not be produced, so Su Yin decided to purify the sulfur.
Due to limited conditions, we can only use the most primitive "heating method" for purification. The sulfur is heated to a molten state and then allowed to cool slowly. The sulfur will be separated into layers due to different specific gravities, and the purer sulfur will float on top.
When sulfur reaches a molten state, the temperature is usually between 112.8°C and 444.6°C.
Therefore, Su Yin also made some targeted efforts on the heating environment. To reach this melting point, it is necessary to maintain the airtightness of the combustion area, reduce heat loss, and help increase the flame temperature. For example, burning in a closed space can make the temperature rise more easily.
Uncle Huo helped Su Yin build a simple mud stove, leaving ventilation holes at the bottom.
It's a simple but effective method like this.
To outsiders, it might seem like they are just playing house, but Su Yin is taking it very seriously.
The group of five worked hard for a whole day but gained nothing.
Su Yin had not yet produced black gunpowder, and the three groups of people originally wanted to heat the walls and then pour cold water on them, using the method of thermal expansion and contraction to decompose the bluestone slabs. As a result, the bluestone slabs were fine, but the three of them were so fumigated that they were crying and snotting.
"I will watch the fire below tonight and will not sleep."
Purifying sulfur and saltpeter both require high temperatures, one for melting and the other for calcining, both require human intervention.
Uncle Huo advised: "Miss, I'll just watch over here, you can take a rest. You must be exhausted after this day."
Su Yin shook her head decisively, "No, I have to watch it myself."
If they failed and had to start all over again, she would go crazy. It was okay to lose a day of sleep, but she must not let these things go wrong.
"Yinyin, Dad will help you watch over me."
Su Yin shook her head, "None of you can do it, I have to come in person."
"It's dangerous at night, I'll stay with the young lady."
Su Yin did not refuse this. Although they had already spent a night here, the danger still existed. No one could tell when it would appear.
Maybe he will appear tonight, or maybe he won’t appear even after they leave.
For safety reasons and for the sake of her 'treasures', it was most appropriate for Su Wuming to stay.
That's how it's decided.
The three of them went to rest, while Su Yin and Su Wuming continued to work downstairs.
The night in the jungle is still very scary, especially in places where you can't see your hand in front of you, which can inspire fear deep in people's hearts.
Fortunately, Su Yin and Su Wuming, who are staying here today, are both strong people. They don't become suspicious and scare themselves.
The night was very long, and to kill time, Su Yin curiously asked about what Su Wuming had encountered while wandering around the world.
Su Wuming is a man who would rather keep silent than talk, but tonight he was very obedient and told many of his experiences in the martial arts world.
It was not until Qingming Festival that Su Yin realized that this guy probably thought she was scared, so he said so much.
Su Yin was very touched by this thoughtfulness.
Although I don’t use it, I feel it sincerely.
After purifying those two things, they are not very pure, but at least they are much purer than before.
Once the purity is high, the effect will be immediate.
With a "bang" sound, the three people working in the cave were successfully attracted.
"What happened?"
"Sister, are you okay?"
Su Wuming was the first to jump in front of Su Yin. At this time, Su Yin and Uncle Huo looked a little embarrassed, with their faces blackened.
When the three men saw their funny looks, they wanted to laugh but didn't dare to.
"I'm fine." Su Yin wiped her face, her hands were covered in black ash.
Su Yin bared her big white teeth and said to the three people with a smile: "Success."
Just like this…
Finally it was done.
Uncle Huo also came back to his senses from the explosion. With a dark face and eyes as big as copper bells, he asked curiously, "Miss, what is this? Why is it so powerful?"
“This is called black powder.”
Uncle Huo immediately thought of the effect of black gunpowder. "Oh my goodness, if the power of this black gunpowder is a little stronger, it can kill people."
Upon hearing this, Su Yin couldn't help but admire Uncle Huo.
As expected of a man who has served in the army for more than ten years, he hits the nail on the head.
Both Su Xinguang and Su Xiaozhong realized the role of this thing.
"If this weapon is deployed on the battlefield in the northwest, it will surely defeat those bastards in the Damong Kingdom." Uncle Huo said gritting his teeth, and his words also revealed the plans of the Su family's father and son.
"It is indeed a weapon with good lethality." Su Wuming also nodded affirmatively.
It seems that men are born to like these lethal weapons. The men present looked at black powder as if it were a big treasure.
"It is indeed a sharp weapon. If used well, it will benefit the country and the people. If used badly, it will cause great suffering to the people."
Weapons are something that depends on who holds them.
With the successful experience this time, Su Yin began to prepare simple explosive packs, placed them under the stone wall, and had Su Wuming ignite them, while the others ran away.
I didn’t dare use too much the first time, for fear that it would be too powerful and cause uncontrollable problems.
The first successful explosion caused cracks to appear on the stone wall blocking the cave entrance, and holes were blown out in many places, but it had not been completely blown open.
The second time I added a little bit more to the original basis.
There was a loud "boom", accompanied by countless small stones flying.
After the cave returned to calm, Su Wuming jumped up to check, then returned in surprise and shouted to them, "It's open."
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