Once Black graduated early and was rehired as a professor by Hogwarts, it was announced.

Black, who was already famous, rose to a new level of fame without realizing it.

Being recognized as a disciple by Nicolas Flamel himself, and even said that he was better than his master, was enough to prove that Black's current alchemy level was not exaggerated.

Coupled with Dumbledore's rehire against all odds, this was undoubtedly a case of two big guys speaking for Black at the same time.

It's not that no one has achieved such an achievement, but that no one has ever achieved such an achievement at such an age.

However, although no one questioned Black's skill level, some people still worried whether the young Black was also good at education.

After all, there are many people who are very capable but can't teach others.

At the same time, the most shocked were Black's classmates.

Are you kidding? We were good classmates and good friends a few months ago, but now we have to call each other professors?

The Weasley twins even suspected that Black had given Dumbledore some strange potion that made him make such a decision. Otherwise, this is too outrageous...

For a while, countless owls swarmed towards Black's house.

Moreover, this was a confirmation letter from someone Black knew.

There are still many letters from people he didn't know and that were screened out.

Two of the house elves invited by Dumbledore to help with the screening fainted after two days and two nights. The remaining ones were just barely holding on.

In the end, it was Dumbledore who discovered it early and arranged the elves' shifts, so that they didn't die suddenly...

Even so, Black still had to face a large number of letters, most of which were from Hogwarts students.

Some asked him to confirm the situation, some asked him what books he needed to prepare, and some asked him how to drug the principal...

Blake took out some of the letters and replied. There was no way to reply to the rest one by one.

He had to write a reply letter and explained that there were too many letters to reply one by one, and then he copied many copies with the copy spell and sent them back.

In those days, the owls of the Owl Post Office in Goderick Valley received the 996 blessing package...

After finally replying to all the letters, Blake was able to return to the research work of the address book.

Nico Flamel's address book can be said to be a simplified version of a two-way mirror.

The communication of the two-way mirror is basically the same as face-to-face communication.

And the communication of the address book requires communication with the other party's portrait. After testing, the communication of information, regardless of the distance, has a certain delay.

However, even so, it is already a very remarkable alchemical product.

Moreover, an address book can storePortraits of many people, that is, one address book can be used to contact multiple people.

However, a two-way mirror can only be used for one-to-one communication, and the cost is extremely high.

Only a legendary alchemist like Nicolas Flamel, who has lived for hundreds of years, can create such a powerful alchemical product.

According to Nicolas Flamel himself, he had to dismantle dozens of pairs of two-way mirrors in order to make an address book...

In fact, only a family with such a background can start from such a loss...

However, thanks to Nicolas Flamel's loss, when Blake wanted to study this, he was standing on the shoulders of giants.

It didn't take long for Blake to make several modified address books.

This address book combines the characteristics of a communication notebook and a two-way mirror, and even some of the characteristics of Voldemort's original diary.

And now, Blake is conducting the final experiment with Rebecca.

"Our first step is to add each other as friends..." Blake and Rebecca each held a black-covered address book and sat cross-legged on the ground.

"Um, Brother Blake, what should I do?" Rebecca asked.

"Think of a keyword and tell me."

Rebecca pondered for a moment, then said, "Silent."

"Okay, open the address book and write this keyword in the blank space." Blake instructed.

Rebecca nodded and opened the address book.

Besides the thick cover, there was only one blank page in the address book.

Rebecca picked up a feather pen, dipped it in ink, and wrote the keyword "Silent" in the blank space.

At the same time, Blake also opened the address book and wrote "Silent" on his address book.

Just as Blake finished writing, the address books of both of them glowed with white light at the same time.

Then, above the keywords in Rebecca's address book, Blake's portrait appeared.

And above the keywords in Blake's address book, Rebecca's portrait also appeared.

The purpose of doing this is to avoid the situation where more people use this thing in the future and encounter duplicate keywords.

Now, with the portrait, even if the keywords are repeated, you can accurately find the person you need to add through the portrait to avoid adding the wrong person.

"Okay, put a check mark on the portrait." Blake picked up the pen and put a check mark on Rebecca's portrait, and then Rebecca's portrait dimmed.

Rebecca quickly picked up the feather pen and put a check mark under Blake's portrait.

Then, in Rebecca and Blake's address books, each other's portraits lit up at the same time, and then the keywords on the page disappeared. Instead, each other's portraits were replaced.

Rebecca looked at Blake's moving portrait in the address book in surprise.

At this time, XiaoThe Blake in the portrait was smiling and winking at him. Below the portrait, there was Blake's current name - "Blake Green"

"Okay, if you want to contact me, just tell my portrait. Try it." Blake said.

Rebecca nodded, and then said to the portrait of Blake in the address book: "I'm looking for Brother Blake."

The next second, the address book in Blake's hand emitted a faint white light and vibrated slightly.

Blake opened the address book and saw that Rebecca's page was glowing.

Blake touched Rebecca's portrait with his magic wand, and then the portrait became blurred. Then, Rebecca was surprised to find that her surprised expression appeared where the portrait was originally!

"Hi!" Blake waved to Rebecca in the general directory.

Rebecca quickly looked at her address book. Sure enough, the portrait of Blake in her address book had also changed, turning into the current appearance of Blake. Moreover, just like in reality, Blake in the portrait was smiling and waving to her.

"This... this is just like making a phone call!" Rebecca said in surprise.

"In fact, it's just like a video call." Blake smiled.

"Video call? Well... it's really appropriate!" Rebecca looked at the address book in her hand over and over again, and she couldn't let it go.

With this thing, no matter where Blake goes in the future, she can use this to chat with him!

"Well, and this also has a message function. If I can't accept your communication request in time because of something, you can use a pen to leave me a message in the blank space below the portrait. Try it." Blake said as he closed the address book.

Rebecca immediately picked up the feather pen and wrote a line of words under Blake's portrait.

"I like Brother Blake the most!"

As Rebecca finished writing, a blue light immediately shone from Blake's address book. Blake opened the address book, and then the sentence Rebecca wrote appeared under Rebecca's portrait.

"Uh..." Blake couldn't help scratching his head after seeing this explicit sentence, and then he used his magic wand to point at the sentence, and then the sentence disappeared from both parties' address books.

"The disappearance of the handwriting means that I have seen your message. At this time, if you send me a communication request again, I may accept it." Blake smiled.

"Wow! This is really convenient!" Rebecca said excitedly, and then she asked: "But if there is only one blank page, then doesn't it mean that one address book can only make one friend?"

Blake smiled and said: "Open the address book again?"

"Huh?" Rebecca opened the address book again in confusion, and then she was shocked to find that behind the page with Blake's portrait, there was another blank page at some point!

"This is just aA simple permanent copy spell... Well, I thought of it when I was writing a reply a few days ago. When you write keywords on it, a new blank page will be copied. In this way, we can keep adding friends. "

"Of course, in order to make it easier to find friends quickly when you have more friends in the future, I have also added an automatic sorting function. The names of the characters will be automatically sorted in alphabetical order."

Rebecca looked at the address book in Blake's hand, which also had only one page of content, and her face was red. "So, after you made this thing, I was the first to know?"

"Well, yes, I told you as soon as I made a few copies and asked you to help me do an experiment. Now it seems that the experiment is very successful. "Blake didn't notice Rebecca's strangeness. He was putting a brand new address book and the instruction manual into a small vanishing cabinet. Along with these, there was also the method of making the address book.

The finished product was made, so how could he not send it to a big guy like Nicolas Flamel to show off? The old man was excited and surprised and praised a few times. Wouldn't he have a high-level treasure chest?

Since the newspaper came out, there were many low-level treasure chests in his system space. If there were a few more high-level treasure chests, he would soon be able to combine the next supreme treasure chest again.

After a long while, Blake opened the vanishing cabinet.

Because he received a diamond treasure chest rewarded to him by the system because of the shock emotion! There is no doubt that this is Nicolas Flamel's emotion! Other ordinary wizards don't have such a high-level treasure chest explosion!

At this time, the address book in the vanishing cabinet had indeed disappeared, but there was a small note.

"Alchemist. "It was written on the small note.

Blake quickly opened his address book and wrote the keyword "alchemist" on the blank page he copied.

The amiable portrait of Nicolas Flamel appeared on the new page.

Blake took a pen and ticked the portrait, and then Nicolas Flamel's portrait appeared on the new page.

Then, the address book trembled, and at the same time, the page where Nicolas Flamel's portrait was located was glowing white.

The white light represents a "video" call, and the blue light means there is a message message, which is a distinction that Blake made before.

He touched Nicolas Flamel's portrait with his magic wand.

Then Nicolas Flamel's portrait changed into Nicolas Flamel's current appearance.

"It's shocking! Blake!" Nicolas Flamel said excitedly. "You really did it! And, in such a short time! Messages, video calls... The most important thing is that your cost is not expensive at all! There is no doubt that you will receive another Order of Merlin, Blake... I dare say that even if Merlin were alive, he would be shocked by you..."

You know, although he made the first version of the address book, his address book was not made until it was manufactured.When it comes out, the people who can be contacted inside have already been determined.

Also, although the cost is not as high as that of a two-way mirror, it is not low either...

Like Blake, not only does it reduce the manufacturing cost, but it also completely makes up for the shortcoming that the original address book can only contact a few fixed people.

"Adding friends in real time... This is a great invention!" Nicolas Flamel said.

"In fact, I originally wanted to learn from the Muggle phone, and everyone has a string of their own 'phone numbers', but I found that it was too troublesome. Since there is a ready-made framework, I just changed it directly..."

If it is made like a phone, there will be very few things that Blake can learn from Nicolas Flamel's "address book", so it is better to change it directly on the existing framework.

This is also the real reason why he was able to make this thing so quickly.

"Oh, I envy you, Blake. Your imagination and creativity are much better than an old guy like me! I have also lived in the Muggle world for a long time, but I never thought of learning from the telephone..."

"No, Nico, you just didn't re-study the address book. After all, when you first created the address book, Muggle phones were not yet fully popular."

"Okay, good boy, let's stop flattering each other... I have to say that your finished product came at the right time. In this way, no one will question your alchemy level anymore."

"I would like someone to question me, but unfortunately... there is no such person now." Blake said regretfully.

He still likes to slap his face and pretend to be cool, but there are too few fools like Shafik in this world.

"You are really special, little guy... Others are worried about being questioned, but you are looking forward to being questioned." Nicolas Flamel said helplessly, "By the way, you said you would use this address book to reform the communication level of the wizarding world, so, have you thought about how to promote it?"

"Just advertise it. Promote it in newspapers and magazines." In this regard, Black is not worried at all.

Grindelwald's "Daily Prophet" will certainly not be stingy to promote himself, and the best-selling fun magazine "The Quibbler" is also controlled by him, so just make an advertisement.

What he has to consider now is who will make and sell this address book.

In terms of manufacturing, it can be handed over to those idle house elves in the subspace, so there will be no worry about the technology being leaked.

As for who to sell it to... Black first excluded all the people and organizations related to the Fourth Scourge.

The address book is closely linked to the name Black Green, and his identity cannot be exposed so quickly.

"Are you worried about sales?" Nicolas Flamel asked with a smile.

"Well, I'm not worried... I just can't find a suitable partner for the time being." Black pondered.

His shop also hasThere are few, but this kind of product he wants to promote to the wizarding world all over the world, just opening a store in one place is not enough.

"Haha, Black, you forgot someone."

"Who?" Black asked quickly.

Nico Flamel pointed to his nose, "Of course it's me."

"I have lived for hundreds of years, do you know how many industries I have?"

"I don't know." Black shook his head.

"Coincidentally, I don't know myself. Because there are too many..."

"So many industries, I can't remember them myself, but they are still running well, because there are always people helping me manage them." Nicolas Flamel said with a smile. He is not a bad old man who only knows how to live in seclusion.

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