When Lawson walked to the vicinity of the glass shop, he saw Savi standing in front of the glass shop and looking left and right from a distance.

At first, there was a trace of worry on his face, but when he saw Rosen, a pair of small eyes suddenly narrowed into a slit, and he walked over to Rosen quickly, and took the package from Rosen's hand: "Master, please come in, please come in." ”

Rosen nodded and walked towards the glass shop: "Yesterday I talked about the problem of sunlight dispersion, have you verified it?" ”

Savidian's eyes lit up with wonder and nodded like a peck of rice: "Verified." Master, I followed the method you taught, put a bronze mirror in the water, and when the sunlight hit the glass, the wall was indeed reflected in seven colors. ”

"Well, that's good. Was there any optical path analysis after the fact? ”

"Analyzed, results and real...... The experiment was very good....... Master, this is truly amazing, I never thought that the sun contained such a wonderful mystery before, I ......"

Savi's eyebrows fluttered, and the small eyes on his fat face were shining.

Seeing that he was about to make a tirade, Rosen raised his hand and interrupted: "Okay, let me ask you, have you prepared everything I asked you to prepare yesterday?" ”

Savi immediately said: "It's all ready, and it's the same." I travelled all over Sunderland and picked out the best medicines. ”

Rosen was satisfied.

After Savi closed the door of the glass shop, he said, "Today, we are going to do two things. I'll do the first thing myself. The second piece needs you to be my assistant. ”

"Yes, Master, I'll do my best."

"Good." Rosen handed Savi a piece of parchment: "I'm going to build a magic mirror with no dispersion." This magic mirror requires very special lenses. The principle of the lens I have written on parchment, what you need to do, is to calculate the specific size of the composite lens, is there a problem? ”

Savi took the parchment and looked at it intently, and after reading it for a few minutes, he couldn't help but admire: "Wonderful~ It's really wonderful~ Master, your wisdom is really extraordinary." ”

By this time, the two had already walked to Savi's studio, and Rosen saw Savi's prepared medicine, and he began to check the quality of the medicine in the same way. After hearing Savi's praise, he turned his head to look at Savi with a smile: "Flattery can't help you complete the calculation task, if you don't hurry up, there will be no time." ”

Savi was taken aback and immediately said, "Ah~ Okay, I'll start immediately." ”

He picked up the quill and counted it on the parchment.

Rosen was not idle, he continued to check the materials prepared by Savi.

'Okay, nothing wrong, but the quality is mediocre, but it's not Sawi's fault, he was able to find all this stuff in Sunderland, which was much more than I expected. ’

Overall, he's satisfied.

After confirming that everything was complete, Rosen first picked up the clay jar filled with olive oil on the ground and placed it on the glass workbench next to him, and then activated the power of alchemy, immersing his mind in olive oil.

The process lasted only a few minutes, and then, Rosen took out a clean glass and gently scooped it into the olive oil, resulting in half a cup of pure, transparent, colorless, odorless, viscous liquid.

This thing is glycerin.

On Earth, the method of extracting glycerin is simple, because vegetable oil contains a lot of glycerin, so it only needs to be heated to a specific temperature and then condensed. In this world, this matter is just a 'purification' process for Rosen, and with the talent of a three-layer elemental friend, it is not a matter of effort at all.

Once the glycerin was obtained, Lawson poured the griffin acid solution into it.

Gryphonic acid solution is a mixed acid of sulfuric acid and nitric acid, the original concentration is about 10%, but Lawson evaporated most of the water molecules in it, so that the concentration was increased to more than 90%, becoming a mixture of concentrated sulfuric acid and concentrated nitric acid.

To be on the safe side, Lawson did not heat it, but used the power of alchemy to catalyze.

Because this reaction would have happened, Lawson did it only with a small push, so this time the synthesis process was much easier than the previous one in the cave.

After a while, a large cloud of yellowish oily liquid appeared at the bottom of the glass, about 300 milliliters.

300 ml of nitroglycerin, this is a big killer, if it really wants to explode in the glass, the splashed glass shards are enough to seriously injure Rosen, and maybe even kill him.

He moved more and more cautiously.

Activating the alchemical power again, he gently and slowly separated the nitroglycerin, put it in a clean glass, and then took out the diatomaceous earth that Savi had found, and mixed it into a powder in a ratio of 2:1.

After doing it, Rosen breathed a sigh of relief, but instead of resting, he immediately took out the lead block.

After nitroglycerin is passivated with diatomaceous earth, its performance is very stable, and it can be detonated by using the power of alchemy, but it takes about 1 second, which is not a long time, but in a tense battle, 1 second may be the difference between life and death. Not to mention, it is difficult to concentrate on the center of the battle, and the detonation time will definitely become longer.

If the enemy is right in front of you, but his big troll doesn't spray, it will be embarrassing.

Therefore, Lawson needed a stable but very sensitive initiating charge. Rosen had already thought about this thing, and that was lead azide, a bullet detonator commonly used on Earth.

Now, with a lump of lead at hand and a lot of nitrogen in the air, he only needs to design the reaction process and catalyze it with alchemical power, and he can get the finished product.

Just do it when you think of it.

Rosen activated the power of alchemy, picked up the quill, and continued to perform quantum mechanical calculations while perceiving the properties of the two elements.

On the other side, the fat man Savi was also desperately calculating.

However, unlike Rosen's relaxed attitude, he scratched his ears and cheeks, his eyes were confused, and after almost half an hour, he made almost no progress, so anxious that his forehead was covered with sweat.

Another half hour passed, and Lawson finished his calculations and began to synthesize.

Savi was still meditating, the feathers on his quill had been bitten off, and the parchment was filled with several sheets, but there was still no real progress.

As the minutes ticked by, Rosen methodically fulfilled his expected plan, and about four hours later, at one o'clock in the afternoon, the first bullet was formed.

This bullet is cylindrical in shape, the thickness of a thumb, the lower part is a rust-proof steel shell, and the upper part is a special dense papyrus. The steel shell is filled with a propellant, and above the propellant is a layer of dense fiber filler to ensure air tightness, and above the filler is a small alloy particle composed of steel, lead, and mercury, each of which is about the size of half a grain of rice, and there are about 40 pieces.

The structure of this bullet is not something that Lawson came up with out of thin air, but is made by imitating the bullet of the Earth shotgun, so there is no need to worry about the lack of maturity of the technology.

In addition, it is worth mentioning that the alloy particles, adding steel, is to ensure the hardness of the alloy particles, and adding the two heavy metals of lead and mercury, has two purposes.

The first is to increase the mass of the bullet in order to obtain greater kinetic energy of the chambering, thereby increasing the stagnant effect of the bullet on the enemy. The second point is more critical, that is, mercury, a metal, happens to be the nemesis of werewolves.

For ordinary werewolves, mercury is highly poisonous, as long as a drop of mercury enters the body's blood circulation, it will take half a life if it does not die. The resistance of the higher werewolves will be better, but there is no essential improvement.

The wheel of the Spiral Troll can hold six bullets, and after completing one, Lawson continues to work hard.

With the experience of the first one, all the materials were ready, Lawson was faster, about 10 minutes later, the second one succeeded, another 6 minutes later, the third one was made, and after that, it stabilized at the speed of one in 6 minutes.

At this time, Rosen had already entered the state, he flipped his hands and flew up, activated the alchemy power from time to time to assist, and was busy for more than 2 hours, even forgetting to eat lunch, making 20 bullets in one go, and consuming all the materials before finally stopping.

Looking at the pile of bullets, Rosen let out a long sigh in his heart: "With the ammunition in hand, don't panic." ’

He turned his head to look at Savi, and saw that the parchment in front of the fat man was covered with sketches, and when he looked closely, Rosen couldn't help laughing, this kid had been busy for so long, and he hadn't counted any of them.

As a result, as Rosen expected, he was not in a hurry, first put away the bullets one by one, carefully wrapped them in moisture-proof parchment, and then walked over and said with a smile: "Savi, how is it?" ”

Savi was startled by the sudden movement, the bald brush in his hand fell off, and after looking up and finding that it was Rosen, he exhaled a long breath and said ashamedly: "Master, although I understand the principle, when I really start to practice, I find that there are still many specific details that I have not figured out. It was much more difficult than I originally thought. ”

Rosen nodded: "You can think so." Don't worry, keep thinking about it, wait until tomorrow, if you still can't figure it out, I'll give you an answer...... Remember, don't be lazy. You will rely on this craft to eat in the future, and now you are lazy and foolish. ”

"Yes, I see." Savi replied with a bitter face.

Lawson took the bullet bag and left the glass shop leisurely, first went to the small restaurant to fill his stomach, and then walked back towards the small courtyard.

As a result, before he reached the gate of the courtyard, he heard Annie's voice behind him: "Rosen, wait." ”

Rosen chuckled in his heart, turned around immediately, and saw Anne walking briskly towards him.

When Anne approached, Rosen immediately asked, "Dias is here?" ”

Anne nodded slightly: "I saw one man after another enter the Baron's Palace. He looked to be in his 30s, wearing a thick cowhide robe and holding a long wooden staff in his hand. He was dressed exactly like the magician of Nilogaard Academy. ”