On the second day, Du Di'an came to this secret alchemy room again. When he came, the poisonous snake and the 'rat' he tracked earlier were also there. The boy code-named Rat should have heard about Du Di'an from Viper. As soon as he saw Du Di'an, he asked nervously: "Hound, right, you, you followed me here, so you...have seen me?"

Du Di Anxin thought that there was no way to deceive, and nodded: "I have seen it, I will keep it a secret."

The mouse was full of frustration and said, "It's exposed again."

The poisonous snake said angrily: "Who asked you to engrave the tattoo on your wrist, I see, you will be purified by the light sooner or later, and then don't betray us."

"I won't betray you." The mouse said with a sullen face: "My family is engaged to me, and I want to quit alchemy now. Anyway, at my level, it's hard to achieve anything, at most, I can get a Meteorite badge."

The viper shrugged and said, "If you want to quit, remember to peel off the tattoo."

"I've been hesitating because I'm afraid of pain." The mouse said helplessly.

Du Dian was speechless, looked at Nightingale's alchemy room, and asked, "Is she not coming today?"

"I haven't come at this time, I guess it won't come." The poisonous snake said casually.

Du Di'an said: "Can I borrow her alchemy symbol book to read?"

"This is optional, but it's best not to touch her other alchemy materials."

Du Dian nodded, and when they were busy with experiments, he picked up Nightingale's alchemy symbol book and continued to memorize it silently. Although he has a super chip, the modern chemical system stored in it is much more advanced and perfect than the alchemy system of this era, but ancient does not mean backwardness. There are still many advantages to this alchemy system worth learning. After all, this is chemistry. The prototype ancestor.

Du Dian first revisited what he memorized yesterday, and then continued to silence the alchemy symbol behind him.

Another day passed.

Du Di'an carried about two-thirds of his back. At dusk, he left the alchemy room with the poisonous snake and the mouse. This time, the poisonous snake was still the first to leave. Newcomers do not worry about them.

After Du Di'an came outside, he saw the poisonous snake hiding next to him again and wanted to peep at him. He ignored it and circled the road a few times in the direction of yesterday and returned home.

On the third day, Du Dian continued to come to the alchemy room. Today, Nightingale was also there. He borrowed the alchemy book and continued to memorize it silently. Before leaving at night, he finally memorized the whole book and could already understand the experiments of Nightingale and others.

From the symbols carved on the alchemy table alone, Du Dian could roughly guess what experiment they were going to do. When returning the book, he quickly glanced at Nightingale's alchemy table and immediately saw a sun symbol, two water drop symbols, and a spoon symbol. , I couldn't help but be surprised. This Nightingale's ambition is quite big, and he studied gold directly. Could it be that he wanted to directly create Sage's Stone?

Fourth day.

Du Dian came to the alchemy den as usual. Today, the poisonous snake was not there. Nightingale and the mouse were busy with each other. Occasionally, the mouse would come out to ask Nightingale some questions. Her alchemy level here seems to be the highest.

"Didn't you read it today?" Nightingale said strangely when she saw that Du Dian didn't borrow books from her.

Du Dian shook his head and said, "Don't look at it."

"No need?" Nightingale was stunned: "What do you mean, you have already memorized it?"

"Well." Du Dian nodded slightly and said, "I want to start learning to do experiments."

Nightingale understood and smiled: "It seems that you have memorized a lot before, I said, how could you be able to do experiments without even memorizing alchemy symbols, if you want to do experiments, you have to buy the materials yourself, today I can lend you some first, provided I have extra, but you have to pay me back tomorrow."

"Thank you!" Du Di was grateful, looked up and swept the raw materials on her shelf, and suddenly saw several raw materials for making black powder. These raw materials are also commonly used in other alchemy experiments. It was first invented by the motherland of China and has had a huge impact on the whole world. It originated from alchemy, and alchemy is equivalent to eastern alchemy, which is earlier and more advanced than the west.

"This yellow phosphorus is my point." Du Di'an pointed to one of the bottles. He naturally did not intend to make black powder here. Although in modern times, this is not a technology, it is a very old technology, but it is explosive in this era. alchemy and it can really "explode"...

Nightingale glanced at it, nodded, and said, "Okay, it just so happens that I have more than one."

Du Dian asked for some more raw materials such as gum and red scales and then cleaned out the small warehouse. At this time, he suddenly found a problem... There is no alchemy platform!

He was a little dumbfounded, this is not the manufacture of black powder, there is already a complete formula, just need to mix the raw materials. He intends to study matches. The last time he detonated a black fire, he felt that ignition was a problem. The fire sickle commonly used in the world is too inconvenient to light. It's time to die.

Du Dian found Nightingale again and asked curiously, "Where did your alchemy platform come from?" No one dared to sell this thing on the market.

Nightingale was preparing the ingredients, and when she saw Du Dian looking for it, she was stunned for a moment, and then she realized: "I forgot to tell you this, so let's go look for the mouse to see if he is free at night. If he is free, I will take you with me. Go to the underground market to buy one, but the price is a bit expensive, you'd better prepare more money, at least two silver coins or more."

"Underground market?" Du Dian was stunned and suddenly thought that Rosyard's notes also seemed to mention this place. It was a market for underground transactions in the Dark Holy See, and it had strongholds in various places.

Immediately, Du Di'an found the mouse and said it again.

The mouse didn't think much about it, and agreed, and took him there at night.

Du Dian had nothing to do for a while, so he said hello to Nightingale and left the alchemy den, thinking that three days had passed, Barton and the others did not know how they were going and immediately hired a carriage to go to the slum.

Coming to a dilapidated square agreed upon in advance, Du Dian quickly found the code left by Barton and others, with a smile on his face, followed the code all the way, and soon found a small remote shack, which is close to the slums refugee settlements.

Just before Du Di'an came to the shack, in a shack opposite the shack, he heard Patton's surprised voice.

Du Di'an looked at it in amazement but saw that the low shack was opened, and Barton and others came over.

"We exposed the secret code, so we rented another one on the opposite side." Barton looked at Du Dian's expression and explained angrily.

Du Dian was stunned for a while, and said with a smile: "You guys are quite thoughtful." Although he knew that the possibility of the password being exposed was extremely low, Du Dian was still very happy to see them being so cautious.