Roland had long conceived of the bullet for the revolver firearm, and the round lead bullet and bulk gunpowder were too backward, and given Anna's processing capabilities, it was technically feasible to directly manufacture copper-shelled fixed ammunition. The key is how to ignite the black powder filled in the cartridge case in the absence of a reliable primer.

The primer of the early metal-shelled fixed ammunition was generally mercury rayate, which was extremely sensitive to impact, and the trigger was pulled to trigger the firing pin, which excited the mercury thunderate at the bottom of the bullet to ignite, thereby igniting the * projectile and shooting the bullet out of the chamber.

It's a pity that he couldn't think of what kind of raw materials are needed to make mercury thunderate, which must be nitric acid and mercury in the literal sense, but the handwritten reaction formula shows that the reaction of these two substances will only produce mercury nitrate*.

Moreover, knowing the raw materials is not equal to being able to produce the finished product smoothly, whether the solution has concentration and temperature requirements during the reaction process, and whether the catalyst needs to be added are also the key factors affecting the preparation of the finished product. What's more, due to its sensitive properties, mercury thunderate can easily trigger an explosion when manufactured, and if he is not careful, he will lose two fingers, so he did not dare to try it himself.

Therefore, Roland had to settle for the next best thing, and still used flintlock ignition in the case of metal shells, which required sparks to enter the shells and ignite the gunpowder. So first of all, there must be a hole in the bottom of the cartridge case, and at the same time, it is necessary to prevent the gunpowder from leaking out.

Obviously, there is an irreconcilable contradiction between these two points: the larger the opening, the faster the gunpowder leaks. If the hole is too small, it will be difficult for the flint to ignite the gunpowder inside.

He needed something that would be able to ignite a spark and plug the hole to prevent the gunpowder from leaking.

Roland's first thought was nitrocellulose, commonly known as fire cotton.

It was one of the few chemicals he remembered that could be used in weapons - because it was made from a very simple material: cotton soaked in a mixture of two strong acids. Acids are the most commonly used sulfuric acid and nitric acid, and they are not dangerous to make. He had wanted to wait until he had recruited an alchemist before making a trial of the cotton wool, but now that he had made a seven-day appointment, he decided to roll up his sleeves and go down himself.

Lifting the quill pen, he writes down his long-brewing ideas on scratch paper.

First of all, cotton, preferably spun and undyed cotton yarn - a thing that had been brought back quite a bit from the Duke's palace and was now piling up in the castle storehouse. Cotton yarn needs to be degreased, otherwise the grease attached to the surface will hinder nitrification. The thing that removes grease is familiar to most travelers, which is sodium hydroxide, which is commonly known as caustic soda. At the same time, it is also a raw material for the manufacture of detergents: sodium hydroxide solution is added to the grease, stirred evenly and solidified in the mold to obtain washing soap. It's just that Roland has been busy developing industry and agriculture and fighting foreign enemies, and he has no time to develop this kind of daily necessities for the time being.

As for how to make sodium hydroxide, the easiest is probably electrolyzed saline. So the prince found that in order to create a new bullet, he first had to start with a DC generator.

Ash walked by the Chishui River, and his mood was faintly low.

Ever since the witches knew that she had come to persuade the Mutual Aid sisters to leave Frontiertown, their attitude towards her had cooled down, and they had lost the enthusiasm they had had when they first met last night.

Moreover, she noticed that most witches practiced their abilities in the castle's backyard, suggesting that Roland had also found a way to avoid being exposed to magical phages. The original intention of exchanging this vital piece of information for the favor of the witches had been shattered, and there was little he could do but explain the pros and cons to them alone and persuade them to leave.

The most surprising of Ash was Roland Wimbledon - his appearance had not changed much, but he had an indescribable temperament in his gestures, which was incompatible with the image of the former gentleman.

He used to be an incompetent person, and the first thing he thought of when he encountered things was to escape, let alone stand up for others, and he was afraid to take responsibility for what he did. Remembering that harassment, it was just a look of disgust that made him fall to the ground in panic. When Tilly heard this, he lied that he had accidentally fallen, and blamed the Five Princesses for why she had chosen such an ugly woman to be her guard.

Since then, Ash's perception of the Four Princes has been at its lowest point.

I thought that such a person would be easy to solve, but she failed to gain the upper hand in today's negotiations, especially after the other party said that she would conduct a one-on-one competition, she found that she could not even use force to coerce - because the other party did not evade the question, but planned to answer her question head-on in the form of a competition. At this time, threatening him personally is useless except to reduce the witch's favor.

Ash sighed, if only she could be as smart as Tilly, any problem would be solved in front of her, if this happens, she will definitely be able to figure out a solution, right?

Before she knew it, she found herself out of the confines of the town, and on the other side of the river was no longer a lush wheat field, but an uncultivated woodland.

Just as Ash was about to turn back, there was a sudden fluctuation of magic behind her, and she subconsciously turned her head, a dagger stabbed out from the side of her cheek, and then slashed sideways. The surging magic had turned into a monstrous wave, and Ash felt half of his cheek be stabbed with pain, and the other party's coherent moves were obviously not something ordinary people could do. She no longer hesitated, letting her body fall completely, avoiding the dagger that swept in front of her eyes, and catapulted herself with one foot.

However, the other party disappeared into thin air, and reappeared behind him in the blink of an eye, and Ash didn't even see how the other person moved.

She drew her greatsword and spun in a circle, sending the blade into a dull whistling speed that caused a cloud of dust to rise on the ground. The attack method without dead ends can remove any threat within the attack range of the sword body, but this move is ineffective in the face of the opponent's strange body, and the giant sword sweeps over the black shadow position as if nothing has been touched.

Oops, she thought to herself, her muscles tensed all over her body, and when she was about to eat the opponent's next round of attacks, the black shadow disappeared from in front of her. The dust slowly fell, and the man was standing not far from her, playing with the dagger in his hand.

Exactly the nightingale.

"Is this a warning?" said Ash, frowning.

"Of course not," she tucked the dagger into her waist, "I just wanted to see the strength of the transcendents." ”

"Really? I thought you were trying to say—"

"—tell you to get out of the border town quickly, or you'll be unkind?" interrupted Nightingale, "what's the difference between me and Hakara. ”

Why did she mention the former head of the Mutual Aid Society?

"You can rest assured that if anyone is willing to leave with you, I don't think Your Highness will stop you, and I certainly won't. But......" Nightingale paused, "don't try to hurt or threaten His Highness Roland, or I won't deliberately stab next time." She grinned and disappeared into thin air, "Enjoy life in Frontier Town." ”

Sure enough, he still came to warn himself, Ash shook his head. (To be continued.) )