On the left side of Wall Street Road, in front of an ordinary alley, a handsome boy passed by holding a piece of black sesame bread. Suddenly, the bread in his hand fell to the ground. When the dust was collected, he didn't pick it up for a while, and it didn't matter if he didn't pick it up. He hesitated before squatting on the bread.

Pedestrians passing by on the street hurried to work, just glanced, without paying too much attention.

The boy lowered his head and seemed to be distressed by the bread, but no one saw his nose twitching slightly.

This boy is Du Di'an. His attention at the moment is all on the sense of smell, and he inhales gently and briefly so that the smell can flow to the olfactory cells on the upper part of the nose and make the senses more sensitive.

There are various kinds of smells on the street, but tracking the smell is like a physical instinct, and it can be mastered without learning. Du Di'an focused his senses on the smell emanating from the hidden room in the alley. A vague outline of the secret room emerged.

"Sulfur smell, yellow phosphorus smell... Someone? Three people? One of them smells a light scent, it should be a girl." Du Di was surprised, but he didn't expect someone to be in this secret room at this moment. Are these alchemist apprentices every day? Are you doing experiments here?

Du Di'an thought for a moment and transferred his sense of smell to the residential house on the street above the secret room, and immediately smelled a faint old gray smell inside. No one lived in it, and it seemed to be empty for a long time.

"Under this empty house is the alchemy room... The owner of the empty house is either dead or the owner of this alchemy room." Du Di'an thought to himself, he picked up the bread, patted the dust on it, and went straight down the street Leaving, although captured by smell, he did not find anyone at the high-end positions of the buildings on both sides of the street, and no one should be especially guarding.

Still, it's prudent to do the full set.

After he left this street, he came to a neighboring street, found a small tailor shop, and entered it immediately.

A tailor apprentice boy greeted him, and said politely to Du Dian: "Guest, what do you need?"

Du Di'an swept several finished clothes hanging in the store, but couldn't find the style he needed, and immediately said: "Help me make a set of black spacious robes and an ordinary mask."

"Mask?" The tailor apprentice boy gave him a puzzled look, but said nothing, "When do you want it?"

"When will it be done?" Du Dian asked.

"Just tonight."

"Okay, I'll get it this time tomorrow."

"No problem, what material do you need, we have linen fiber, satin..."

"Strong and ordinary fabrics will do." Du Di'an asked: "How much is the deposit?"

The tailor apprentice boy thought for a moment and said, "If you want to be strong, thick flax fiber is the best. There are two kinds of seven copper coins in total. The deposit is half, and you will receive three."

Du Dian immediately took out three copper coins and gave them to him, saying: "The robe should be a little bigger."

"Okay." The tailor apprentice boy agreed with a smile, took out a ruler to measure the body proportions for Du Di'an, and wrote a note to Du Di'an, saying, "Just come and pick it up tomorrow."

Du Dian put away the note, left the tailor shop, and muttered, "The next thing is the tattoo."

If you want to sneak into that stronghold, you must prove that you are an alchemist and the most credible way to prove it is to show your alchemy tattoo.

However, this era is far from mastering the laser. Once the tattoo is on the body, it is difficult to wash off, and every time he returns from hunting outside the wall, his body will be checked to prevent the virus from being brought into the wall, which cannot be hidden at all. tattoo.

He pondered for a moment, and finally decided to take a risk.

...

...

An ink raw material factory in the eastern suburbs, like most factories, is located in a remote location, close to the radiation area.

Du Di'an came here, and when blocked by the guard, he showed his guard medal and said, "I'm here to do business. By the way, I will routinely check your production environment."

The two guards were a little stunned, looked at them repeatedly, and they confirmed that they were not mistaken. One of them immediately winked at the other, and then said to Du Di'an: "Wait a moment, I will inform you immediately."

Du Dian nodded and stood at the door waiting.

After a while, the previous doorman trotted out with a short and stout middle-aged man. The middle-aged man saw Du Dian from a distance and was stunned for a moment. He didn't seem to expect such a young guard, who looked like a mature man. The child, but immediately put on a smile and said politely: "Hello, why didn't you tell me in advance when you came to check? Isn't our place under the control of Lord Crow all the time?"

Du Dian waved his hand and said, "I just stopped by to have a look, mainly to find you some business. Do you have gall ink here?"

The middle-aged man was relieved when he heard this, and said doubtfully: "Gallnut ink? This quantity is very small, and it has been discontinued. Now everyone uses carbon ink."

"That's good." Du Dian nodded and said, "Give me a bottle of gallnut ink raw material."

"Uh..." The middle-aged man was suddenly choked, looked at him up and down, and said, "Just one bottle?"

Du Di'an coughed lightly and was a little embarrassed. After all, this is a factory and not a store. However, it is difficult to go to the store to sell gall ink raw materials, so he can only come here.

"How much?" Du Di'an asked the price directly, not giving him a chance to refuse.

The middle-aged man was speechless, but he still maintained a polite attitude and said, "What kind of money are you talking about with me, just treat it as a gift for you."

Seeing this, Du Di'an was also welcome, and said, "I'm short on time, so I need it now."

"No problem." The middle-aged man glanced at him and said, "Is that all you need, no... anything else?"

Du Dian smiled and said, "Just drop by."

Only then did the middle-aged man breathe a sigh of relief, knowing that he was a false alarm, and said with a smile, "Okay, I'll have someone pick it up for you." After speaking, he turned and left. After a while, a thin young man sent Du Di'an a bottle of pitch-black ink.

Du Di'an can smell the ink inside without opening the cap. It is gall ink. This kind of ink was used on the wall in the early days. Later, after people learned to use coal, they made carbon ink. This kind of high-cost ink is expensive because of its high price. , Gradually fewer and fewer people bought.

Du Di'an left with ink, went to the store to pick up a bottle of men's perfume, took it home, and locked it in his small room.

The smell of gall ink is much lighter than that of carbon ink, and carbon ink is often used by people, and the smell is more familiar, which is why Du Di'an took the trouble to buy gall ink.

"It's a pity that there is no activated carbon here, otherwise the smell in it will be eliminated." Du Di'an secretly said, he poured out part of the ink into a small bowl and then poured the lighter perfume he chose into some, and the smell Neutralized, smelled, and felt that the smell didn't become weird, so I was relieved, and then stripped off my shirt, revealing a healthy wheat complexion body.

Du Di'an looked down at the magic mark on his chest, and said secretly: "I don't know if those alchemist apprentices recognize this magic mark, anyway, it's better to hide it." Immediately, he put the ink on the quill pen and ran it along his chest. The blood-red magic mark in front was drawn, and the cold ink fell on the magic mark, smearing this blood vessel-like magic mark into pitch black.

"This dagger scar should also be covered up, so as not to attract attention." Du Di'an drew the ink along the dagger's scar. The scar was vertical, but the magic mark was horizontal. After painting, Du Di'an found two pens crossed together, which happens to be a black cross.